I have a D.P. 120 Ultimate, DP says he flys it with the 120FZ. Guys on R/c Universe say it flys great, but not unlimited vert w/ 120. I would like to know, would you put the 140 L, 140 S, or 140 DZ on this plane? One of the guys in my club has the DZ and has had a hard time with it. Please advise.