Reply to VST designed laptop

Hey, it is time to get me a new laptop, but my knowledge ends on gaming things and I dont know what spec's is best for using vst plugins, abelton and traktor...
My aim is to get i7 core, loads of ram and probably intel graphichs or nvdia, I'm not sure about AMD or athlon.
Anyway what will work best for music production or mixing (mainly I'm mixing with 4-deck controller,) + if I add some more controllers?
And the last question is do I need a separate sound card if controller has one? How latency is affected by sound card? Thanks!