agree with feedinggear...of course analog mixing requires much more skills, I even heard some dj calling digital or cd-mixing "cheating"...but who cares? :P
@Monobeat: I didn't think of mixing without a midi interface even for a second, of course
the question is: do I need a top-class laptop or I can do it with a normal pc [of course a dedicated pc, no other shit on it]? and what about the audio interface?