Guess what I'm writing this on...
I bought mine when they first came out. I still rate it, plenty fast enough for general use, very small and almost silent. OS X is much nicer to look at than windows and hardly ever crashes.. maybe once or twice in all the time I've owned it.
As Bolide says, the newer ones aren't such good value but I'm sure eBay could turn up an early model at a bargain price. Happy hunting!
Cheers,
Gaz