The best thing to do is call properties you are interested in staying at and ask to speak with a Casino Host. They will go over everything with you and explain "for 4 hours a day at $xx a hand, you get..."
Generally speaking, comps are more favorable at downtown casinos than the strip properties. Literally, you will probably only need to bet half as much compared to the strip for the same comps.
And within the strip, there are obviously different tiers also. Higher-end strip properties like Bellagio, Manadlay Bay, etc. will require higher bet averages then some of the lower end properties like the Excalibur, the Tropicana, etc.