The Burger Bar (at Mandalay) has a good beer selection. So does Todd English PUB at Crystals at the City Center. The food at both is solid (the pastrami at TE Pub lives up to this New Yorker's high standards and all the food there was excellent). Also, while not something you'd usually do with a good beer, if you chug a pint in under 7 seconds at PUB you get it for free.... I'm not much of a chugger but was with a group of friends for a bachelor party and the contest went over pretty well as you could imagine.
As for beers to try, Stone, Green Flash, Speakeasy, and other west coast brewers should be readily available. Somehow, I always end up drinking Fat Tire when I'm out west. Nothing better than a pint of Fat Tire and some prime rib! (preferably after a day of skiing in Colorado powder but a night out in Vegas is a close 2nd)