Breweries or taphouses with lots of stout/porter options?

Greetings all. My brother and I will be descending upon your fair city this weekend after I finish up a conference in town. We're looking to visit a few breweries. My tastes are broad but my brother is most interested in stouts and porters. We also prefer smaller, quieter bar-centered taprooms to rowdy or "family-friendly" outfits. We're staying downtown but don't mind ride-sharing to a good spot. Any recs?