Honestly of all 3 I have had the best result with a BK1.5. Its just a BK1 with the BK2 suspension. That by far is the best of the 3 IMO. That and I loved the Bk2. I never really liked the CR,, but like I said IMO. Hope this helps.
JConcepts/Werks Racing Engines/Ironman Bearings/PowerMaster Fuel/VP Racing