some folks are still reporting KOTOR issues in W7, I think this is a combination of causes including some graphic card incompatibility, and issues with digital copies
Whilst I havent tried them in W7, JO/A worked fabulously in Vista, so I dont see this being marred in W7.
Im not sure what the prices pan out to be like but if I wasnt too worried about cash and wanted a gaming centric rig, Id probably go for an alienware rig - ontop of them knowing what gaming rigs are all about - they look pretty nice.
Of course, fondness for small form factor pcs makes it pretty hard for me to go past shuttle barebones - especially my current GTX295 toting SX58H7. Fits under your arm. Kicks a$$, blows wallet into chunks
good luck Primeski