Ok I hate to chime in with the macs are better guys but I got to say macs aren't that exspensive compared to pc.
I will explain:
You can score a powermac G5 dual for not that much:
eBay: PowerMac G5 dual 2.0 ghz PCI-X, Superdrive, Tiger/iLife (item 190031823257 end time Sep-19-06 18:15:28 PDT)
Now that price seems like a alot but consider what you get:
2 - 2ghz processors
8 slots for RAM exspantion and included 1gig (count it thats up to 8gigs of RAM)
160gig HD and room for another
And a video card that supports dual monitors
You don't get a monitor but hey most people who buy these don't want to get stuck down with what is included.
Now lets take a PC that compares to this (I went with this because the PC is obviously for recording)
eBay: Computer Digital Audio Workstation Cubase Sonar DAW PC (item 140030068393 end time Jan-14-07 09:06:08 PST)
Again in my opinion overkill for the average home recording studio but around the same price as a powermac.
Now as far as the "exspensive idea" this just isn't true you can score a mac mini wich is more than capable of being a DAW for less than $700.
As far as PCs go I am not saying that they suck because they don't its the os I have a problem with. XP is not as easy to use (so many posts concerning how to get hardware to work on XP in the other forum I'm in) as OSX and has way more issues as far as working the way it should, plus microsoft is not exactly Johnny on the spot with updates. And I find the biggest disadvantage is the dreaded virus issues it has.