who do you recommend as a barrel chested AI sire?

What are some AI sires that you recommend to add width of chest, spring of fore rib, and substance of bone without coarseness??? I am not stuck on one certain breed, although we do have mainly black cattle...AngusXMaineXChi, but I am not afraid of color. (I am always on the lookout for a good Charolais, Shorthorn, or Hereford heifer/young cow to put in my pasture.)