It's been a while since I had a good drink (weep with me) but I've always favored darker beers. One of my favorites is Deschutes Obsidian Stout, it's dark and delicious. I'll second Shiner Bock, as a good drinking beer; it's not fancy, but it tastes good, and I can drink a lot when I want. I also love Duck-Rabbit Milk Stout, Allagash Tripel, Foothill's Brewery's The People's Porter, Roth Brewing Company's Dark Construct...
Dang. I'm gonna stop there. I'm getting thirsty.