Apple computers. I've had two iMac's (intel) and two mac minis (one PPC, one intel) and they're shoddy. Cheap, crappy internals. CD/DVD drives that break after a couple of uses. Fiddly to do anything with beyond what Apple want you to do. The only thing saving this iMac I'm on now is that I can install Ubuntu and Windows 7 on it, other than that it would be a £1,000 paperweight.
Two years ago I bought a bare bones PC system for £150 with a cheapo AMD X2 chip and it still beats every Apple computer I've ever owned