I have a new AMD 64 3700 with 2 gigs of ram, and a 7800 GT vid card running Win XP 64 bit. It's a good combination of hardware, and the games scream on it.
I also bought an 17 inch intel iMac a couple of months ago. I punched up the Ram to 1.5 gigs.
I've been a Windows guy since windows began.
I now do everything on my mac. I like the OS better. It feels right to me, and I don't have to worry about hardware and driver support. It was the right choice for me and my DAW needs.
Make sure that you take peoples opinions as opinions. Make sure you that the opinions that you put some value to, are based on facts and experience, not speculation and heresay.
Since I've gotten into the mac world, I've heard an awfull large amount of negative comments about Macitosh computers, often based on an experience with an AppleIIe from 1989.
So, to summarize. I HAVE both OS's running on new machines, and I prefer the Mac. By a long shot. I think that it is a way better Operating system. Dollar for dollar, mac is a smarter buy.
My mac has never crashed. I don't think this PC has, but I maintain it, and am a very educated end user (and only use it for games nowdays). I also have a ghosted image of the PC hard drive, just in case. I do expect it to crash eventually. I don't expect my iMac to crash.