Depends on how much you want a Mt Viper. They are becoming increasingly rare -- especially the '04 and '05's, which are tough to find.
If you really want it, I'd say up to $3,500 is not over paying.
Mt Vipers are a great do it all sled and even a fantastic every day trail sled. They have great off trail control and lay down very easily and controllable. I'd say maybe the easiest mountain Yamaha to lay down off trail ever made. The Mountain Max is good too.
As a fellow TY'er I strongly caution you from this purchase however. Not becuae of this price, which I don't feel is out of line. But because it is only the beginning....... Then come the mods.
Don't get me wrong, you will love every second of it.
And Barack Obama, Geithner, SLP, Master Card, and Visa will love this purchase because nobody can leave a Viper like this stock.
First it will be Triple Pipes and skis. Then a Boss seat and 2" or 3" riser. It never ends and soon you will have a $13,000 Viper. And you won't regret a minute of it.
Just saying.......