Getting a gaming laptop for 5-boxing

[Presby]

I've been looking for a gaming laptop just for solo play, but in the event I get into multi-boxing (it's been my dream for a year now) would this be able to handle it?

http://www.frys.com/product/6054438?...H:MAIN_RSLT_PG

The 2 main questions I have are these:

Is quad-core worth it? I know WOW only handles 2 cores, but if I'm running 5 copies of the game would the 4 cores really help? Otherwise this one is duo-core:

http://www.frys.com/product/6054428?...H:MAIN_RSLT_PG

Also, how important is an SLI setup for graphics cards? The top laptops I linked above both have a gig of dedicated VRAM, is that enough?

Any and all help is greatly appreciated. Please help me live my dream =)

EDIT: I'm looking around the $1,000 - $1,300 price range, if there are any other laptops out there for around this price I would appreciate the tip.
EDIT2: I was thinking of upgrading the RAM in either of the above laptops to 8gig, is RAM going to be the main hold-up or am I going to run into processor speed problems first?