The fastest mac book pro is $2500 2.2Ghz Quad-core
The fastest Imac is $2000 3.1Ghz Quad-core
The fastest Mac Pro $5000 12 Core 2.66GHZ
Thus the best Mac Book Pro is still less powerful than an IMAC. and the Mac PRO is a class all on its own.
But I can't get a PC laptop cos I use Logic Studio. So basically, makes the choice simple.
Mixing Engineer www.acoosticzoo.com