Ref - Saturday night only stay - may be worth (if you have an Amex platinum) trying the Fine hotels for Bellagio, it used to be a VERY good deal. On last trip - each room got $100 in resturaurant credit per room, a guaranteed upgrade, and 2 breakfasts per day (*which was actually 2 buffet comps, or $60 in the cafe daily). They also hadn't cottoned onto fact that if you book single nights and move room using the 4pm checkout guaranteed to the wifes card that you ended up with $100 in credit per night in resturants, making them nearly pay you to stay. I have no idea on the fine hotels deals this year, but in previous years it was a REALLY good deal, and so good that we generally stayed on it every trip in Vegas.
Also, look at Wynn - not Encore - lovely rooms, and can be had if you join their "club" online via their website for ~$125/night including a buffet comp for breakfast for 2 from time to time. Like Palazzo (next door) it isn't central, but the pool is lovely, it's opposite the mall, Treasure Island, and next to Palazzo... but it does have a public bus stop nearby to avoid the walking if you need to.