Hacker makes great motors. You won't be disappointed with the quality.
Have you checked ground clearance with a 14" prop? I seem to recall that even with the taller TnT gear not being able to go over 13" in diameter.
As an alternative to MotorCalc, there is also e-calc:
http://www.ecalc.ch/motorcalc.php This is an on-line motor performance calculate that I find very easy and convenient to use. There is a $6.00/yr fee, which seems quite reasonable to me.
Al