I've been riding Lib or Gnu for about the same amount of time as the OP. Been on a '10/11 Riders Choice and picked up an Arbor Coda this year. I think Arbors parabolic rocker (or whatevs) is a fun change of pace to the C2BTX.
Coda is a little more playful that the RC. RC is a little more stable when bombing. I tend to ride my Coda when conditions are ideal and my Riders Choice when I need to bust through crud all day.