Fat Shark HDO
Fat Shark HDO might not be a perfect set of FPV goggles, but they are the best in the most important aspects: quality, size, and support. Great OLED screens that are not too big, so you do not have to move your eyes like crazy to see OSD voltage. Those are my FPV goggles of a choice. If they only could put a power switch on them... Oh wait, HDO2 will have a switch...
You might be tempted to choose the cheapest available FPV goggles as your first goggles. There are reasons to do so, but I strongly advise against it. If you do so, not only the quality might be way below expectations, but also FPV experience will such and you will have to buy new goggles right away. This is why I recommend beginning with a "middle-class" bucket style goggles like Eachine EV800D. Don't get me wrong, they are still bulky but image quality is acceptable and they can ack as an FPV monitor too.
To be honest, FatShark FPV goggles were always slightly overrated. Sure, they are "the best", but SkyZone goggles were always pretty close and much cheaper! My first and second goggles were SkyZones and I liked them very much! For half a price of Dominators (when receiver module is counted) you can get SkyZone SKY02X with built-in diversity, DVR, fan, and much better DVR that the one in Fat Shartks!
If I would not buy Fat Shark HDO, I would buy SkyZone Sky03D. The reason is simple: great image quality, nice and big OLED screens, build-in diversity receiver and DVR that is much better than the one in any Fat Shark goggle. All of that reasonably priced compared to the competition. So yes, this is $200 cheaper (when you count receiver module you have to buy with Fat Sharks) competition to HDO!
Caddx Tarsier 4K
Caddx Tarsier is a surprisingly good Split/Hybrid-like camera. Or to be honest, two cameras in one package. There are two lenses, two sensors, 4K capable recorder, and WiFi. The box says it can also do image stabilization, but I seriously doubt it. In 4K mode, image is rather so-so, but switching it to 1080p 60fps improves things a lot. And since there is a separate sensor for FPV, there is no extra latency!
RunCam Eagle 2 Pro
In my opinion, RunCam Eagle 2 Pro is the best FPV camera period. Excellent color, excellent WDR, very nice low light handling. 16:9 and 4:3 switchable. I use this camera in the majority of my airplanes and drones. Not the cheapest camera, but worth the price!
Eachine TX805 is cheaper than most and yet, works pretty nicely. OK, 800mW mode is only theoretical, but 200 and 600mW are real. I have it in 3 of my quads, including "high-end" Armattan Marmotte and I'm really happy with the results! For the price, it's a real bargain.
Matek VTX-HV 5.8GHz
What can I say... a very solid VTX that can be powered directly from 6S LiPo, has a real 500mW output power and MMCX antenna connector. On top of that, legendary Matek build quality, can be configured by Betaflight and INAV and has standard mounting holes! What else do you need?
AKK FX2 Dominator
AKK FX2 Dominator can be described as "moar powah". AKK packed not 1W, but 2W of output power into this monster. If the range is the main factor, and you do not want to migrate to 1.2GHz VTX, AKK FX2 Dominator is your choice. Dual heatsink, 6S support, SmartAudio and a build that will survive almost anything!
The Rush VTX series is one of the most interesting positions on the market. Not only they provide up to 800mW of power (and yes, in 99% of the cases you do not need more), the output is actually calibrated! That's not what you get in chinesium VTX nowadays! Add full SmartAudio Support, easily readable LEDs for the band, channel, and power, and you have a very good video transmitter at a reasonable price!
Matek VTX-1G3 1.2GHz FPV
If long-range is what you expect, why not to go 1.2GHz instead of 5.8GHz FPV? Much more range, lower power levels needed, better energy conversions! Matek VTX-1G3 brings Matek quality we all love in flight controllers to a brand new area: long-range FPV! It comes with a PCB antenna and is small enough to fit most airplanes. If you want to install it on a drone, you will have to be creative tho!
AKK X2 Ultimate
AKK X2 Ultimate packs more than enough power for the majority of mini quads and airplanes. SmartAudio, MMCX connector and a reasonable size. What more do you want from a video transmitter? OK, maybe it's not the smallest one, but if you want to pack more output power in to a VTX, you just have to make it slightly bigger!
FuriousFPV True-D X
The next generation of Fat Shark compatible receiver modules from FuriousFPV. It's a improved version of a well known True-D and it brings a few improvements: better hardware and image quality, very nice OSD and a built-in lap timer. The trackball turned out to be quite good improvement over standard 5-way switch too.
Eachine Pro58 diversity receiver
Eachine Pro58 is probably the cheapest worth having Fat Shark compatible diversity receiver. Comparing to the compatition, it is absurdly cheap and yet it still works. Don't get me wrong, it's not the next ground breaking piece of hardware. Eachine Pro58 just works. On top of that, it can be upgraded to Achilles FPV software to unlock extra functions. If you are on a budget, then Pro58 might be the receiver module for you.
ImmersionRC rapidFIRE 5.8GHz receiver module is probably the best receiver module! Superb video quality and super fancy-magic way of combining images from both diversity receivers. As a result, it keeps the lock like no other and gives you the best video feed you can get in such a small form-factor. Not the best for long-range missions, but even then does the job pretty nicely!
FuriousFPV Dock-King is not an FPV accessory that everybody will need. Let's be honest, the majority of pilots do not need to have something like a ground station on a tripod. There are, however, cases when something like that might become quite useful: when using 1.2GHz Matek 1G3 receiver, using external LCD instead of goggles (very useful on longer flights) or wanting to mount your antennas high in the air. FuriousFPV accepts all kinds of Fat Shark compatible video receiver modules, has full support for True-D series, has 2 video outputs, an external port for DVR and the HDMI output module.
Probably the cheapest option to have a DVR of your FPV feed when goggles do not have a built-in DVR. Don't get me wrong: It works and only works. Original firmware might have PAL/NTSC detection problems and both bottom and top parts of the screen might not be recorded. Nevertheless, it works...