Quote Originally Posted by zanzabar View Post
pro is equivalent to vista biz and ulti is ulti, so u get media center on top of pro. and pro will be the one to get since ulti is a limited edition product now
Not completely. With Windows 7 each version will be a superset of the other. In other words, all features available in Home Premium will also be available in Professional, which does include media center for example. Just check here for a reasonably complete rundown:
http://www.winsupersite.com/win7/win7_skus.asp