I agree with those above. WAIT for Windows 7. The RC is a better OS than Vista.
Back to your question....
In Vista, you can get 32 bit or 64 bit version of all of them EXECPT Vista Starter.
One reason to wait for 7 is the change in the way the versions are sold.
In Vista, Home has some options, Business has others. However, they do NOT overlap many of the features. Only Ultimate has them all.
In Windows 7, Home has features, Business will have all the features of Home PLUS some directed at the business end of things (IT networking and such really). Ulitmate has everything that Home & Business has, but one or two goodies meant for large networks.
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