@gandalf

I'd say they all have OEM bios's and therefore can't be OC'd

I'd hold off on a DX 10 card right now myself, remeber the first DX9 cards (ATI Raedon 9700 Pro)? they can't really run fully DX 9 games, I imaging the same applies with the 2900/8800.

the PSU is a bit small, but I've seen a 500W unit run a Kenstfield @ 3hgz and a single 8800GTX, so I wouldn't worry about it too much.