I don't seriously expect anyone to choose Vista, but my uncle just said that it is in fact quite good on a brand spanking new top of the range king of all PCs. (Obviously with less adjectives lol.) I included Linux and even Mac out of fairness, I have nothing against Linux, though I know nothing about the Mac system except to stay far away from it. I used it once for a while, don't remember the name of the OS, just know to avoid it. Anyway... Get voting. Please try to keep this from degenerating into a flame war... PLEASE! Oh yeah, my money is on XP, though I do hear that 7 is getting to almost rival XP, but for the amount it takes up on your hard drive.