So many good places. Tria Rittenhouse or tria Washington west, resurrection ale house, the pope, ladder 44, varga bar. Philly puts many other cities to shame when it comes to craft beer. My best suggestion, check out phillytapfinder.com and look at the tap lists of the places I mentioned the day you are in town. You can even search by beer. Follow the beer and you won't be disappointed. Enjoy Philly, we pride ourselves in having good beer.
Edit. I just reread your post, either tria would be good for lunch, resurrection, ladder 44 or varga. The pope is too hipster for a work lunch.