Which Windows Vista do you need?

Much of the press has made much of the fact that there are five Windows Vista editions to choose from compared to XP, which had just two - Home and Professional. My initial reaction to having so much choice about an operating system was one of recoil.

Assuming I'm going to use Vista, I hate being forced to choose between products that really take quite some time to evaluate. In actual fact, however, there are only four choices since most of us individual buyers will not be involved in the purchase of Vista Enterprise.