If you're simply chasing carcass merit, I'm not sure you can get much better than (Rito) 9M25, problem there, is good luck finding semen. That being said, I've seen Crossover sire some darn good carcass cattle (including reserve carcass steer @ 2010 NJAS), but there you run the risk of dirty pedigrees. GAR Ingenuity offers a clean pedigree with astounding carcass numbers (including a 1.23 REA last I checked), backed by Igenity; just not sure he's the right type & kind for my style of cattle- then again, he's a TERMINAL bull, so all progeny are assumed to be projected as fat cattle anyway IMO.
Hope this helps

-Sam