Hey guys, a buddy of mine and I are designing a gear reduced long tail like the Mud buddy super long tail. looking for a little more top end, what prop would you recommend? MB's site says a 9x5 but does that become a 9x6 or 9x4 if I'm looking for a higher top end? I'm in utah and run at 5000ft so I don't know if that changes it either. Also, which brand should I look at? looks like lots of guys on here are having problems with mud buddy props. Thanks for the advice!