The way I was looking at it, there are many breeders getting foal crops every year sired by a super nice proven stallion, and out of some of the ugliest band of mares that don't even look all that great
Good looks do NOT make a good horse.. You may have the prettiest barrel horse ever but the ugly horse with great backing and talent will beat your pretty horse every time.
I understand you wanting to breed her.. Truly I do.. But there are way too many horses out there already that are better or can produce better than your mare. She is a very nice looking mare and she's built well..But looks aren't everything, conformation isn't everything, and you wanting a nice foal out of her will not make is a nice foal.. She hasn't done anything in her lifetime that screams "I need to be bred, I will produce a nice prospect"..She may pass on nothing but pretty, and even that's not guaranteed.. Then if she is registered with APHA you will not
be able to register the foal with APHA or AQHA if you breed her to a Quarter Horse.. It will be a grade foal out of two unproven horses..
Honestly, take a step back and look at it through another's point of view.. If you were looking to buy a new prospect and came across this "would be" foal.. You would have a MAYBE nice looking grade foal, that came from two unproven horses...You'd keep looking wouldn't you?..I know I would.. and there is NO way to tell that you will be able to keep the foal it's entire life.. When breeding you want to think of the foal first, you want to give it the absolute best chance at life..The registered foal from two proven horses, great bloodlines, great looks, and the possibility of having the skills of the parents will sale WAY before the grade foal who may have potential.. Then there is also the other risks you're taking.. Are you prepared for the possibility that your mare may die whole foaling? The foal may die also.. Are you prepared to deal with complications? Vet bills? If the mare dies can you take 100% responsibility for the foal like feeding and such.. and in another thread of your's you have already had a foal last year and you're already having problems caused by neighbors coming onto the property and starting bad habits with the foal you already have.
I just don't think you're thinking about all of the facts of breeding.. It isn't just breeding two horses and hoping for a pretty baby.. Right now, at best from your mare and that stallion you're hoping for a pretty grade foal that may have the possibility of having good traits..That's it.