Aah, got it.
A sticky wicket.
Hence your restraint. Well, fingers crossed for you with the mare...there's something about her I like. That said, you have endless possibilities - lotsa horses out there. No need to rush into anything. Do any of the dressage barns offer lessons on schoolhorses? A good Training level / First level schoolhorse(master?-the most carelessly-used description in dressagedom IMHO
) You can investigate the trainers and barns and dip your toes into the dressage pool at the same time.