Cannondale TwentyNiner 1
Being stiff, light, and a fast climber, the Cannondale TwentyNiner 1 is an awesome cross-country race bike. The big wheels roll fast and eat up terrain, which, along with its stable handling, make it a decent descender for a hardtail. I must admit to being spoiled by riding nothing but full-suspension 29ers the past couple of years, but its harsh ride coming down is smooth compared to any 26er hardtail.