I thought about upgrading it but I really liked the feel of the 27.5 and 29ers when I rode them. I think I've decided on a GT Karakoram 29er Sport. It has the Alivio rear derailleur and it felt really nice when I just test rode it.

If I decided on upgrading the Cannondale, what upgrades would you suggest? What are your thoughts on the GT Karakoram Sport 29er? PB has it for $499. Seems like a good deal.