I am not an aircraft owner, but do have some current knowledge...
AOPA's affiliated lender is Bank of America. If you qualify for the loan, their rates are competitve: 6.75%. If you're a first-time aircraft owner, they'll want 30% down. AOPA is a good resource for you, but BOA are not "airplane" people.
The folks at Dorr Aviation Credit are "airplane" people. They are much easier to talk to and their rates are almost as good. They just offered me 6.85% with just 20% down.
Another good airplane finance co. is Zook Aviation.
YMMV. Good luck with your plans, and, yes, putting aside every penny you can for awhile is the best place to start. Hope this helps.