carbon Rush or an Ibis Mojo
what do you think?
Haven't tried the Mojo but... no Lefty and a lot of pivots where it gets muddy as with most VPP bikes... Test ride both, that's my final word!
They are really different bikes for different purposes. The Mojo is more of a "rough trail to AM" bike with a shorter top tube and 140mm of travel, the frame weighs in at close to 6lb. The Carbon Rush is more along the lines of a "marathon" and 24 hr race bike with 110 mm of travel with a longer top tube and nearly a pound less frame weight. I know they have the same head angle, but remember the Lefty has more offset which reduces trail so it handles about a degree steeper than a conventional fork.
I think it depends on the kind of riding you want to do. If you want a fast bike for XC terrain and some racing that can handle some rough stuff then the Rush, but if you want a more stable bike for technical rides, but could still ride the smoother stuff then the Mojo.
To put it another way I would race the Rush without hesitation in an endurance race and feel it wouldnt hold me back, I wouldnt race the Mojo unless I just wanted to finish and didnt want to compete for a top place. But if I was riding technical trails here in Phoenix or a trip to Moab I would probably elect for the Mojo.