EXS 24 Logic Sampler Users Group

Going to the darkside and buying a pc laptop for work (huge apple fan).  I'd also like 
to use the laptop for exs/logic/softsynths/reason, etc, specifically for playing live.

Any must have's to make the laptop music friendly, such as Pentium 4 mobile, 
hyperthreading, minimum ram, bus speed?  Any brands or issues or things to avoid?  

Any thoughts would be greatly appreciated...and if there is a better place to post this, 
please let me know.

Thanks!