I also recently read that PC World (or some comparable publication) tested Windows Vista on multiple makes and models of computers. A Mac (I don't recall which one) ran Vista the fastest out of all of them (it included a ton of PCs).
I know a lot of people don't like Macs, but they really are quite good computers. Just because they're not PCs and they're different doesn't make them bad. In fact, I'd argue that those differences made them A LOT better. Just my $.02....for what it's worth.