If you want to try a quad copter get the RISE Vusion RTF system. It's a good flier and you can use the flat panel display as a ground station or install it in the headset.
You could then get a separate camera and transmitter and antenna if you wanted to try it on a plane using the same flat panel display.
You don't want to spend $400-500 on a set of goggles and then find out you can't wear them. With the RISE you can find out if you can wear goggles and then eventually move up to a better set.
A higher powered transmitter is not required and in FPV racing they don't allow anything more powerful than a 200mw and to be honest you don't need anything more powerful than that. What you do need is a very good antenna system. A real good antenna can get better results with a lower powered vtx.
Also you need to have an FCC HAM license(tech license) to legally operate most FPV systems.