CPU speed matters fuck all if you are running
Digidesign ProTools HD DSP cards.
As far as price is concerned there isn't this mystical huge gap between Macs and PC... that is if you are comparing a Mac to a "built for music DAW" PC. Don't get me wrong... a PC is and will probably always be less expensive than a Mac. But it is terribly misleading when you hear... a Mac costs $3,000 where as I can get a Dell for $899. That is like saying, I can buy a Pontiac for $35,000 but a bicycle for $99. They will both get you across town. But Jesus... what if you need to go from LA to Atlanta? The Pontiac (Mac) will get you there. And the bicycle (PC) will probably breakdown (crash) around Phoenix.
Now if you have a high end PC specifically built for recording digital audio, then you can get a quiet machine, a fast machine, a stable machine, and in many ways an arguably superior machine than a Mac. But you are certainly not paying $899 for it. Look at this link:
http://www.carillonusa.com/
The Core System 5 is $3,099. Now go over to
www.apple.com and check out their Apple store. You can get a dual 1.42gHz CPU machine with 2.0 GB of DDR RAM and all the sweet Apple bells and whistles (DVD burner) for $3,700. The is only a $600 difference.
So basically it does in fact just boil down to what you prefere. The Apple platform or the PC platform. It depends on which software you want to use (MOTU, and eMagic are apple only.) If you want to work in a "professional studio" then it always helps to be familiar with the Mac platform. It is like this... most people that use Macs can easily switch over to using a PC but there is a glitch when it is the other way around.
Plus a lot of Mac owners just see the Mac as a much more logical platform... I mean Jesus, on a PC you have to click on START to shut the damn thing down. That is strange in and of itself.
But like I and others have said... go with what you feel and just politely show your middle finger to anyone that says anything against your decission.