I would breed her to WR Wrangler to get a good first calf out of her with no worries during calving time at all. I don't know a lot about many of the show bulls, but I do know that there are very few that I would breed a heifer to. If she is larger framed, as a lot of charolais are, you could probably get away with using a show bull, but Wrangler will always be a good option if you can afford to have a purebred calf out of her for the first year.