OP, your post leaves many questions unanswered and I doubt you will get any stud reccomendations on the info provided.
Why the wide variety of breeds?
What is your mare? Is she registered? Does she have fantastic conformation that screams breed me? What are your plans for the foal?
Can you raise a foal for less than you could pick up something similar for? Stud fees, vet care for the mare, raising the baby until it's of training age, cost of training, and on and on.
Breeding isn't something to be taken lightly. It should be done with an extreme amount of thought & planning as well as the knowledge it takes to raise a foal.
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.