Hitachi is generally considered the best in pneumatic nailers, but I don't know if you can get one for under $200. Bostitch and Senco make good ones as well.
Honestly, for occasional DIY use, any framing nailer beats no framing nailer. I'm talking Harbor Freight, Campbell Hausfeld, whatever you can find. Also check pawn shops, Craigslist for a used one, just make sure they can demonstrate it for you before buying it.