I too think you are placing a lot of emphasis on one foal. I bred Rabbit, who is now 26 years old. NEVER in his whole life, has he ever produced a foal to replace or even equal himself. Not for me. He has had only three colts I consider good enough to be Stallions ( I am very picky about Stallions) He is actually a much better mare producer. I have twenty of his daughters, grand-daughters and great grand- daughters, and I have had HUNDREDS to choose from. Not one is like Rabbit, each is their own person. This is a horse that has won too much to even remember, let alone mention, and I did not start showing him till he was fourteen. I think you need to start looking for a registered gelding or filly that you can show and have fun with , now. A foal that could well end up disappointing you, through no fault of it's own, is not the way to be going. Before you go any further you need to have Midnight tested for fertility- this is dead simple and not costly, and may put your dreams on hold right there.