Wanted to congratulate you on walking away from that seller. You made the right move, especially if you want your little one to learn to show. There are many nice minis out there, and you can check the LB Sale Board here for some possibilities, too. Lots of times they have very nice horses for sale, and can tell you about them. I found a wonderful show gelding for someone who contacted me looking for a horse for her daughter, and I found her one on the sale board here, and now her 8-9 year old daughter is having the time of her life showing him. He was an experienced show gelding, and he was transported right from the AMHA World show by another farm here in Florida, who was showing at World's, and we made arrangements that were quite reasonable for the horse to be delivered when they returned after the show.
The daughter has been very pleased with her little gelding and she's been learning from him as well, since he knew the show routine.
Good luck in your search, and sounds like you are moving in the right direction, and we're certainly here to help you in any way we can.