For you guys, expert on different machines, Which of these pros pro machines would you pick. Difference in cost is not much, so money is not a big concern. Its either a pros pro challenger(either model1, model1 Rot or model 2) or pros pro pilot. Difference is one is drop weight while the other is crank,right? Constant pull vs Lockout, right? Recommendation between these two particular models? http://www.arfaian.com/default.aspx?PreKatNr=9 Any differences you can recognize between challenger2, challenger1 and challenger1 rot?