Even though its going to eat up your wallet I would go max out the specs of the latest mac book pro.

I had my 15' retina now from just when it came out, I maxed all the specs out and I have never had any problems with it. When I'm using it live I use it to control DMX run Traktor and Modul8 at the same time so basically It's my Dj and Lighting control laptop in one.

(btw this reply is for very advanced DJ's that need reliable and very fast equipment)