Sorry guys, bit off topic but I thought i'd jump in after the Hackintosh mention...
I've done the whole Hackintosh thing. I've been into PC's for years and that was my first foray into modern Macs. I ended up not using XP much at all, but there were too many problems. It's extremely critical to get 100% exactly the right hardware, or it's very unstable. Macs are largely stable because the software is only written for specific machines. Common OS updates from Apple detroy the hacked part of OSX so you had to re install, and on a real mac you have none of these issues. Now you can get a 20" iMac for $1690 AUD and it's a perfectly silent brilliant studio computer I don't see the point. Or get an $849 Mac Mini, they've improved a lot now. I don't own a PC anymore, no need. I reboot into Windows for Colin McRae (RIP... a momement of silence please) DiRT, but the audio stuff i do it on the mac side.
On a mac, you start it up holding down T and the whole computer becomes an external hard disk, great for backups or file transfers. There is no BIOS, to choose startup disks you just hold down a key on startup. If you kill the OS you can do an archive and install over the top.
And for comparisons sake, an $849 mac mini's CPU is faster than any pentium IV machine ever made, period... just has a laptop hard disk, but still good for 50+ audio tracks in logic easily, if that's not enough put an external on.
I love the fact that on the mac most audio interfaces need no drivers, they're supported natively by the OS, and you can mix and match and combine them as one. Example, you have an external USB/firewire box with 2 i/o, and you need 4 i/o for a live setup for a separate headphone mix. You can create an Aggregate device and then any somewhere sees it as one big 4 i/o interface, the external and the laptops built in audio. Very cool. Multiple apps can use the same audio device at once, no glitching, it's so solid.