I guess it comes down to how close you want to be to the Stadium, both Circus Circus and Harrah's are walking distance. Harrah's has always seemed much nicer than CC but I have never stayed there, just walked thru and seen a show or two there. The Peppermill just did an enormous renovation, so I would imagine it is nice, but have nothing to go with there. One other possibility I would throw out is the Grand Sierra, they have suites there with a nice steam shower that run about $100 a night. But of the three I'd say either Harrah's or Peppermill, with the deciding factor being if you want to walk, or be a little isolated away from downtown.