So I have acquired the regular 42" front end for the sled, along with a nice set of stage 3 Elka Shocks are on order. Should make this about perfect for what I am after.
Dad has a BCX - we put a set of Freeride KYB clickers on the front. Haven't ridden it, but it should be darn close to perfect. Its going to be a fun sled. I agree with the gear up to a 23/45. The 21 runs out really well (even with my XTX sidewinder 141 to 80) but a 23 would be a great compromise with the 1.6 especially.
Glad you landed on the BCX rather than the POO - rode one in MI a few weeks ago, its no where near the same caliber of sled.