Palms
Bellagio=eye candy? Not.
If you want eye candy, there is no better to place to stay then either Mandalay Bay or the Palms (the one with the Playboy Bunny logo). Rio and Hard Rock is also party central. People who stay at the Bellagio tend to be pompous folk and in my experience, it's over-rated. If money is no object, check out Venetian and the new tower, Caesars, Mandalay Bay, TheHotel, and Wynn.
Any of the hotels mentioned above except the Stratosphere, Imperial palace, and CC are fine. The best value for your buck goes to the Coast hotel chains.
As far as Circus goes, the only thing going for it is that it's a pedophilia haven and the steak house is awesome. Otherwise, it's a flea-bitting dive.