If you never tried it, I HIGHLY recommend Fogo De Chao! Very expensive but well worth it. Brazilian steakhouse is something else, will not disappoint.
I haven't tried Fogo De Chao yet, but Texas de Brazil in Town Square is freaking awesome. As far as buffets, Bacchanal at Caesars would be my pick. It's a bit pricey, but worth it. Also, Rao's in Caesars is really good.