My 12 yr old son and I have determined that life would be good with a Super Cub in the family. I previously owned a 7ECA Citabria which was a fun airplane, but a little limited. Tell me, Great Cub Gurus, what to look for in a good Cub for Western Alaska. Is a -125 or -135 desireable? What is the difference between the PA18 and PA18A? Thanks!