I just have a few questions. What do you want out of the foal? What is your goal when you think of breeding your mare?
Your mare is very nice, but she's a barrel horse. And your wanting to cross her to a western pleasure horse? Is your goal to get an all arounder or are you looking at using the foal for western pleasure or barrel racing?
Personally, I wouldn't use that stud on her if she was my horse. Because, for the obvious reason that she is a barrel horse and he is WP. If your wanting a pleasure foal out of him/her, chances are it isn't going to happen. And if your wanting a barrel horse out of her/him, chances are that isn't going to happen either. My thinking is that your going to end up with a mediocre foal that isn't really going to excel in anything particular because it doesn't have the right breeding to go in a specific direction.
I guess I'm just confused by the stallion that you have chosen for this specific mare.
"The greatest pleasure of a dog is that you may make a fool of yourself with
him and not only will he not scold you, but he will make a fool of himself too."