Personally i would get the 2500 mobile and OC it to 3200 speed. It will OC to that speed at 1.6 vcore which is lower than the stock vcore a 3200 runs, so a stock heatsink is all you need. The price of the 2500 mobile is around 1/2 the price of the 3200
Oh yeah i heard ATI released the x800 series in AGP, haven't checked that out yet though, if true AGP is good for awhile yet..