Which windows do i buy?

I have a copy of my windows restore xp sp2 media center that came with my dell xps 710 desktop. I'm not sure if this will work or not. and when i looked at newegg.com all they seem to sell is system builder edition. What should i buy or will my current windows copy work?

It'll probably work OK with parallels.

I don't think media center edition works with bootcamp though. When I did it, I used XP pro sp2. I beleive that and home edition are the only ones supported.