Go with a P-5,and get a 053 or JP-2 pipe.
Collari,Carbs have little probs,Fast motor,Pipe-O.S. 2050
V-Spec,Front bearing leaks,Need to get a Novarossi front bearing if you go with a V-Spec,Fast motor.
I run a P-5,My dad uses a Collari B-7,and our buddy uses a V-Spec.I think the P-5 holds the best tune.
Land Bowyer