"Without considering the gaming advantages of Vista, it's clear to us that the new MS OS is worth the asking price - providing you can pick up an OEM copy. Full-version Vista is best saved for a) those who don't mind forking out over hundreds while only getting Home Premium and b) those who buy with new systems.
Whether you choose 64-bit or 32-bit Vista will ultimately come down to how far ahead you want to push. Yes, 64-bit is more secure and is a 'cleaner' operating system, with less backwards compatibility and more headroom for the future - especially if you're using more modern hardware. However, 32-bit is the smoother upgrade for most people, and is probably the one we would recommend to almost everyone."