There is a mint-condition one for sale near me for $ 3,500.00. MAN, I wish I could just go out and buy it. Since I haven't owned one before, I can't review it, but from what I've heard, they are built with the best of everything (parts-wise) and will hold their own against piped Banshees and 250r's.
You could probably race one in its stock form and take out some 450's on the MX track...