For the strip, there is no better beer bar than the Public House at the Venetian (not to be confused with Public House at Luxor). A great list of taps, and even a couple cask brews (only found here in Vegas!). They also have the first Nevada, Cicerone, a Beer Expert that makes sure to take care of your requests and match your palette with the appropriate brew and food pairing.
Prices can be a little high.. but it's the strip, it is to be expected. Their Gold Standard burger is legit.... Guinness Aoli compliments it perfectly... but it's pricey.