Ah, looks like I'll be spending a lot more for the retail version (I don't mind, I've always ran pirated copies of Windows, so it'd be nice to have a good clean owned version). Also, seeing as I am getting the retail version, it comes with 32-bit and 64-bit on the one DVD. I'll be running 64-bit as I've looked up all the programs I use and people are telling me they are running all of them on 64-bit with no trouble, plus I'm getting new hardware so it all has drivers for 64-bit Vista. If I come across too many problems, I'll just switch to 32-bit.

Also it'd be nice to get the 4GB RAM and the 512MB GPU RAM to all be running instead of a limit of 4GB including the GPU RAM. I heard it makes a great difference on 64-bit.

Thanks for the advice guys.