I don't hold a grudge against the Mac and everyone that uses one, but I do prefer PCs for just about everything, even recording. That said, here's what I've come across in looking into this same quesiton for myself a while back.
Macs are limited in choices for soundcards, software, etc. If you are wanting to get
the Digi001 and ProTools LE and don't want to bother with the potential problems with the brand new version for the PC (which is only Win98 now anyway), the Mac might be the way to go. I think you can get hardware that's better for the PC, but that ProTools LE is really cool from what I've seen. You can get a quality setup with a Mac, but it's going to cost some serious cash, mainly just for the G3 or G4 horsepower. Whereas with a PC you can get decent quality at much cheaper prices, and there's so many options that it'll take a lot of research just to narrow it down to a few choices for soundcards.
The Mac might be a little more stable for recording, but I think that's mainly because you wouldn't be using if for many different purposes. If you dedicated a PC to nothing but recording and ran NT or Win2k you can get a machine that's practically just as reliable. Using a PC for multiple purposes isnt't a problem, just be prepared for the occasional crash by backing up everything regularly.
Another thing I think important is that most people here doing computer based recording are using PCs, and are more likely to be able to help if you run into problems with PC based hardware and software. Then again, maybe no one using a Mac is posting because they aren't having any major problems.

Seriously though, lots of people here that can answer questions concerning PCs and all the recording stuff related to them.
As you say yourself there's many other things you can do with a PC, and you could buy one machine for everything instead of a Mac to record with and a PC for everything else. That's a big money savings right from the beginning.
If you were completely on the fence in terms of which way to go, didn't really care to own a PC or didn't plan to buy another PC already, and have the dough to drop on a good Mac recording setup I'd say consider both options. Since none of that seems to apply to you except for the money part, I'd go with the PC.