So...Couple of things to ask:
1) Are you wanting to hook this up to a plane, or a drone? If you're going to go to a drone, are you planning on racing, or flying for video? If you want sharp video, save your money, buy a DJI and headset there. I say that because the quality of the cameras and the video feed you will experience flying are not going to be high quality on other setups. That said, the DJIs aren't really meant for fast action/reaction, like what you see in the MultiGP or DRL races. They're a smoother, photography style flight.
2) If you are going to fly it on a plane or racing drone, you don't need much more than 200mw. Remember, the bigger the mw, the more power it uses. Additionally, the higher mw usage (i.e., 800mw and above) may not be legal for use or for sale in the US. 200mw is what most people use to prevent signals from stomping all over everyone else in an event, and even then, that may be a little strong, limiting you to 8 or fewer racers at a time.
3) As for goggles, there are many different kinds that you can go with. I started with a pair of the Quanum Cyclops V2 goggles, offered by HobbyKing. They are a box style goggle, and the V2s came with a standard dipole antenna and scan button to find whatever channels were being broadcast. I got them on sale for $60, but upon a search on HobbyKing, they are no longer sold and have been replaced with the Diversity goggles, for $80. These goggles are great to go over glasses, and definitely within the sub $100 price tag; if you are starting out with FPV and not sure how much you're going to do it, I would HIGHLY recommend these for your first pair. If you find that you want to move up to something nicer, then you can move up to something like the Fatshark Attitude V4 goggles, which I found MUCH more comfortable to wear than the Cyclops. Fatsharks tend to be more immersive, as they have a screen for each eye, but are also more than 3 times the cost for a quality pair. That said, you have higher quality parts - a better receiver in the Fatsharks, for example, AND almost all of the Fatshark goggles have a DVR built in to record everything you see through the goggles. But, is $300-$500 in your budget? Right now, from what I'm hearing, probably not. So I'll suggest the Cyclops Diversity goggles for right now, and you can save them for backup or ride-alongs, for people who want to see what it's like doing drone flight (word of warning, have them sit down for their first flight LOL)
Are the FXT Vipers good? Yes, they're very good - and the 2.0 version comes with DVR functionality. Is that worth an extra $80 for you? That depends. I would say that if you are starting out, it's probably not worth it, but then, that's my opinion, and opinions are like politicians - there are too many of them and they all stink. LOL The one thing to know is that they are a box style goggle, and they are kind of big and bulky, but they tend to be a little better for vision than other goggles if you wear glasses.