The upgrade prices...check out this article. It gives the upgrade cost from the XP equivalents to Vista.
I just bought a new HP laptop with XPpro. I know I get an upgrade to Vista Business, but I wanted to know how much extra it would cost to upgrade up to Ultimate and I can't get an answer. Hp couldn't tell me and Microsoft sent me into "email from hell loop" that never answered my question, I gave up! Anybody have the answer?