AS AN AFTERTHOUGHT: I definately won't be upgrading until the last minute, gauging the last minute is completely subjective, but i will let all the clowns who dash out to buy VISTA be the free ms fault finding service, hehehehehe. I wait till its stable. :)

TIME TO CUT THROUGH THE CRAP: Unfortunately if you are serious about gaming it is not a matter of if, but, when you will upgrade to Vista, this is self explanatory. (As othe commenters have explained). The Price is the primary concern for me, ( i admit i have not studied any benches yet). Upgrading will be expensive, but an effective upgrade may be very very costly, depending on how taxing the Vista Os turns out to be. I will explain what i mean: for those of you commenting on needing to upgrade to 8 gig of ram i say keep your uneducated nonsense to yourself: Lesson 1: x par2= 32 bit address bus= max addressable ram= 4 gig. I would like to see some reliable benches on system load to determine how much $ an upgrade is gonna cost me in real terms, i.e: ugrading may not involve os alone. A+/net+ certified it engineer.