I have read through the previous posts and it seems like most on the board speak highly of Cut, Delmonico's, Carnevino, SW, Prime.
What about more of an old-school steakhouse?
About 6 years ago I was staying overnight at the Renaissance next to the Convention Center. I was surprised how incredible their steakhouse was. I think it is called Envy.
Where would anyone recommend either on the strip or off for a thick cut, large ribeye and incredible sides. A great martini and a terrific Ceaser salad.