That is going to depend on what kind of setup you are wanting to run. If you don't mind running some wires from your head to a Rx, get the Base goggles from Fatshark. However if you want an all in one unit, get the Attitudes or Predator V2's. The predator will be far less expensive with a smaller display, but will work. Base is better, but doesn't have a Rx module in it which makes it much lighter. The Dominator V2's are pretty good as well, but you are looking at about $450+ just for the goggles and Rx.
And for Tx, I would only suggest the 5.8ghz immersionrc Tx's. 600mw is good, but over kill for most people. 250mw will do you just fine. In fact, if you are not going long range, you can get by with a 25mw just to get your feet wet in FPV.