Nice looking heifer. Is she registered Limousin, whats her pedigree?
Simmental wouldn't be my first choice, I don't think the breeds compliment each other very well.
What are your goals for the calf?
You almost have a purebred heifer, why not breed her to a purebred bull?
We used Hunt Testament, DHVO Deuce, and RUNL Stetson on our heifers this year. If you are looking for a show heifer a new bull that might work would be FC Angels Answer. If she needs moderation we have used Xerox and Excessive Force with pretty good success.
Good Luck!