New Gaming System Card.... Need Input

I'm building a new gaming system, mid-range, and trying to decide which card to go with. I'd like to keep it around the $200 range. I'm going to go with either an e6300 or 6400 cpu.
With the new DX10 cards coming out, I'll probably be upgrading the card in a year or so when DX10 games start rolling out.

I've seen a few discussions about x1900 versions versus 7600GTs versus 7900's.

Within the above parameters, anyone have some input or ideas as to which direction to head? Any suggestions will be greatly appreciated.

Thanks