MAC and WoW
-Amount of RAM
(There are other factors to consider, but these are the big ones)
I think all current Macs use relatively speed i5 or i7 CPUs of varying speeds.
These Macs have integrated graphics and will probably run the game well at lower settings:
-Low end 13" MacBook Pros
These Macs have laptop-sized graphics cards and will be able to handle higher settings:
-Other Macbook Pros
The current Mac Pro model is very dated and you should try to hold off until the fall refresh if you want to go with this line of machine. The current model supports full-size desktop graphics cards (more powerful than laptop-sized cards). I'm not as sure about the upcoming refresh, it's a totally new case. We're not sure of the full range of graphics cards options that will be available for this new machine either, so while we would like to see it outperform a fully upgraded iMac, we'll see.
I don't think you can buy a Mac today with too little RAM to play the game, but if you do choose a Mac and want to add RAM, Apple charges a lot -- find your RAM from a third party reseller such as crucial.com (I have bought upgrades for a few of my previous machines through this website, and will probably do so again for my 27" iMac someday).
FWIW I used a 20" iMac from the end of BC through the first few months of MoP. The game never ran better under Boot Camp (Win XP) than it did in the native Mac client. May depend on the machine to some degree.
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