I'd buy the 64 bit version for your desktop though. I just bought this for my laptop. One of the most seamless, trouble-free, easiest OS installs ever. For the first time in a long time I feel great about the way I installed my OS . I've go two separate partitions, one for the OS and the other for everything else. No Vista...Life is wonderful for my laptop right now.
I'm installing the few games I play as we speak. I'm excited about my first "real" OS.