I just went to Jean Georges Steakhouse at the Aria has wonderful steaks!!
I got the ribeye I believe it was 18oz.They also offer an australian aged kobe steak and some other steaks as well.
The food was amazing as the side dishes on their menu they have truffle potatoes that are a must.
I would also have to agree SW Steakhouse in the Wynn is another one of my favorites.
I also liked Kokomo's in the Mirage it is Steak & Seafood I like the theme of the restaurant it resembles the rain forest.
One more place I have to agree with another reply Texas De Brazil all you can eat meat with many different side dishes to choose from.I had a gent take me there once and I have been back many times since.If you try Texas De Brazil have to try the side dish the sauteed mushrooms are very good!
All this talk of steaks has me hungry now.lol