And then you suggest an nivida DX9 card over an ATI one...
Why the 8600GTS I suggested? It gives good scores, great framerate, does both DX9 and DX10, requires little power, overclocks well, has a dual lifetime warranty when registered, is very quiet (and I have a quiet setup!), and runs very cool even on the stock HSF setup. Plus, it is on sale for $160 with MIR and with that you could save the other $30 towards getting another in SLI if you so choose or a future DX10 upgrade.