The Peppermill is great, check their website for deals. They also have a really good buffet, (maybe the all-you-can-eat ice cream seduced me). The buffet at El Dorado is really good also, (okay, they had all-you-could-eat gelato, I'm beginning to see a pattern here). They did not make a dime off me that night! The rooms at Circus-Circus, Silver Legacy and the El Dorado are usually a good deal price-wise but you might not want to be right in the middle of everything. Check all their websites.
Have fun on your trip!