There is also a Smashburger at Fashion Show LV. Right now online there is a $5 off $5 at Smashburger coupon floating around. Google and you shall find.
I really can't recommend The Peppermill enough it is a Las Vegas staple on the strip, it is a favorite of the performers to visit after their shows. Very cool vibe there and good food.
Visited LV recently and ate at The Peppermill for the first time. Loved it! Echoing above, it's a very comfortable/relaxing place and very good food. I'd like to go there real late to see who might walk in the door. Open 24 hours.