Thanks guys! I made up my mind now its going to be MBX5. Now engine choices, I know many of you guys will prefer the P5 but my LHS only sells OS VZB and Picco XP G1. I read the RC nitro mag bout the OS and they claim that it has lots of power but I also read it somewhere that the VZB has problem, it looses its compression quickly not even a gallon thru it. Now has anybody got experience with picco engine?