Is there that big of a difference for gaming? My plan (as of this second) is to buy the 24" iMac with the 8800 and Boot Camp into Vista Business 32-bit. But should I fork out the money for the 64-bit version even though it seems the only difference will be that it can address all 4 GB of RAM vs. the 3.35 GB (thereabouts) under the 32-bit version? Would the only real benefit of the 64-bit version be seen using a Mac Pro with over 4 GB of RAM? Thanks.