How much computer is enough?

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It all depends on what you are Running, Serato and Virtual DJ run beautifully on nearly any machine. more intensive DVSs require higher specs, Traktor Scratch Pro (I Use This) require specs that are nearly unachievable on a PC for 100% perfect Use. even on a MAc it gets sketchy sometimes. ableton is the same.

but although I am an AMD user in the real world, for music software Intel 100%
and for what it's worth if you use external drives, always go Lacie.
 
Spend 10grand and get the latest gear you can get and then it may be the best it can be in say 6x months
maybe it will get old in less than 3x