You really shouldn't breed her. A first foal on an older mare is extremely hard on them. Unless you are doing an embryo transfer (and that's not successful that often on older mares, and costs around 5000+ to do).
I wouldn't breed to any of those stallions. I wouldn't buy them as geldings for trail horses. They just aren't good enough. I suggest looking around more, and really looking at the conformation of the horses. Look beyond the color. Color can make a great horse even greater, but it never improves a bad one.
If you do breed, I'd get a lot of advice. I wouldn't suggest breeding an older mare though. A lot of things can go wrong.