Not having a mid-range PC that isn't an all-in-one. I think the iMac is slick as hell, but it drives me crazy how wasteful it is. In this era of companies and individuals trying to be all "green," it is kind of screwed up that they force all mid-range computer buyers, really the bulk of the market, into throwing out a perfectly good monitor when the computer is outdated (or having to throw out a perfectly good PC when the monitor takes a shit). I'd love to buy a Mac, but the Mini is just not powerful enough (I'd like to be able to play WoW on it occasionally). The Mac Pro is just way overkill. Something with the iMac horsepower would be fine for me, but no, Apple does not offer any standalone PCs at the mid-range. Grr.