Why not the E6850 it's sometimes cheaper than E6600 and run faster on 1333 fsb. The 8600GTS is a good card and also Vista ready. I have both 8600 and 8800, the 8600 seem to work the same as my previous AGP 7600 GS though. Only tested with Swat4 for now.

Dell computers are not bad or anything. Only I think they are more for people that don't want to go trough all the trouble of selecting compatible hardware and tweaking evertything into detail to their personal needs.