The Golden Eagle at the North end of the Strip.
It's a normal place. Good food for a reasonable price.
Better for lunch than dinner.
Battista's Hole-in-the-Wall on Flamingo, across from Ballys (in a strip shopping center). It's not the cheapest place, but the food is excellent. You can get a complete Italian dinner for $25.00 / head with tip.
Any cheap buffet is going to have a pretty long line. and of the "Stations" have a good buffet, cheap, and the lines are reasonable. Sunset Station (I believe) comes highly recommended by a guy at work, and he's a buffer expert.
Good Luck
Scott