Your location says MD, so am I right to assume you live in Maryland? I board and have my horse trained at a lovely dressage barn in Mount Airy. Full board + training is $800/month and a lot of the time you get discounts with the vet and farrier if you schedule appointments on the same days as the BO's Andalusians. If you're still looking, I would recommend at least visiting this place if you are able. Everyone is really nice there. The BO is a bit strict, but I find I like that. She is extremely considerate of the horses.
Whatever you choose to do, I hope you make the right decision for you and your horse.