I'd look at Chic Please, RC Fancy Step(chance of a double dilute,tho) and there are a couple others I really like, but sure can't think of right now, lol!
I'm breeding my mare to RC Fancy Step and have seen him in person, he is MUSCULAR and gorgeous in person. His foals are really typy for reining horses, those I've seen anyways, but you are looking at a possible cremello foal, and may not want one.
Chic Please has been a longtime favorite of mine, his fee is very affordable and he is a proven performer and producer. I love his looks and will probably breed to him in a couple years when I'm ready for another prospect out of my mare.
How is your mare bred? What level do you show her since you say she is a reiner? I'd love to see some pics! I don't show, but sure hope to later on!