Most of the good casino's on the strip are pretty good. I know, having stayed at at least 10 differents ones of them over the years.
I was at Monte Carlo in March, it was good.
Alladin is also good and not as brutally expensive as Caesars.
Bally's is cheaper than Paris and about the same overall hotel quality, just not as new.
Caesar's was my favourite, but it costs the most of where I have stayed.
I refuse to pay the price for Mandalay or Bellagio or Venetian as they are not worth the extra $75+ a night.
If you want to go whole hog, try out the new Wynn's. I will be pricey, but if the extra couple of hundred does not matter why not check it out?