There are many of them.
Can't give you any personal recommendations if you're breeding for show stock, but we breed almost all of our commercial heifers - AN, ANxSH, SimAngus - to high CED Simmental sires. Have recently used Triple C Bettis, WS All In W111, Hooks Pharoah 16P, and this spring, After Shock. No calving issues whatsoever; Bettis calves came small and easy...but didn't grow off like his WWepd suggested they should; Pharoah calves have been decent; too soon to tell about the All In calves(all less than 2months) - but they look good.
Believe we bred one older heifer (18mo) to PRS Blazin Hot last fall... and she had no problem delivering.