Circus Circus will have the best rooms for the price on the strip. They are always well maintained. Look at the casino web site to get the best rate. Normally around $45 per weekday nite. If you have stayed there before ask for the repeat customer discount. That said, a lot of people don't like all of the kids running around the property.

If you want the other end of the strip try Excaliber. Slightly higher than Circus but decent rooms. San Remo used to have some great deals also but I have not stayed there in several years.