On Saturday I got to meet the Appy! He is an amazing horse--friendly, trusting, smart, energetic, obedient, and fun. I got to ride him for 45 minutes, and he was great--very responsive to leg and rein cues (When I was riding him I accidentally gave a wrong leg cue, and he started doing a dressage half-pass thing. Pretty neat!), and seemed to actually LIKE being ridden. I learned that he has been ridden by hundreds of people in his life, placed in English Saddle seat, barrel racing, and reining when he was a young buck. Most importantly, he felt safe and relaxing to ride...I wasn't afraid to get on him. It has been awhile since that happened!
He is on a Glucosamine/MSM supplement now from Valley Vet and eating senior feed. I got to watch him get his spring shots and a womer, and I loaded him into a trailer by myself. Nothing phases him!
As of now, I am planning on going ahead and bringing this beautiful appy boy home. Thanks again for all of the advice everyone, and I will keep you posted! :)