I had to bite the bullet and get a new PC the other day--(I had a window of opportunity I HAD to use).
I went to Alienware and got a Intel Core Duo @ 2.66, 2 GB RAM @ 800, Vista Home Premium, and a GeForce 8800 GTS (320mb).
I was skeptical at first, about Vista--but I haven't had a single issue with it--and I really like the performance, and the way it looks. I'm running Flaming Cliffs, Silent Hunter 4, and World in Conflict--all maxed out in graphices--with no problems at all.
I'm hoping I can use this system for DCS:BS, and perhaps BoB. I figured if I need to--I can upgrade the processor to a quad, upgrade to 4gb of RAM, and another video card for SLI.
For all the Alienware Haters out there--I was really pleased with the end result--very professional--excellent wiring and cooling included. I don't know if it was worth the extra $600 bucks--but for reasons I won't go into here, I had no choice.