Please! don't do the 32bit version! I know that there are some hardwares that won't work with 64bit Windows, but if Microsoft keep releasing a 32bit version the hardware makers would just make 32bit compatible drivers. My general problem is that I use After Effects, I have 4GB of RAM and can't add more RAM because it Windows 32bit can't use it. Can't buy Windows 64bit because many of my hardware won't come with 64bit compatible drivers. And I'm not talking about a webcam, Is about heavy printing machine and video cards, sound cards etc. I'm sure that Windows 7 will be much heavier than Vista and would need about 4GB just for the OS, I wouldn't be ok to limit a max of 4GB.