+1 for building your own with a Linux OS or buying a Mac.

I've switched over to a Mac mini and MacBook Pro for my daily computing, am swapping one Windoze box to Linux and one to a Hackintosh.

I run Windows games on my Mac using Crossover Games from Codeweavers. $40 and I don't have to pay another license fee to Redmond, WA or bother rebooting the computer. The one drawback to Crossover (based on WINE) is that game patches sometimes require getting on the bulletin boards or digging into specific files -- nothing really hard and the folks on the bulletin boards are very helpful.