I've seen lots of recommendations for the 5.11 Taclite Pro pants. Those are OK but what I like 100% better are the 5.11 Tactical Stryke pant. The main reason I like it over the taclite pro is that the cut is much more flattering. I'm not really an "athletic" build by any means, but the Taclite Pro was super baggy on me in the front and in the legs. Think pleated dress pants...way too baggy for my taste. The Stryke's legs are closer to regular-cut pants. The fabric on the Stryke is also stretchy and moves with you, plus the expandy waistband (I think the same as on the Taclite Pro) easily accommodates weight fluctuations or an IWB holster.
Other than that I'll throw an additional vote behind the Kuhl Renegade pants (super stretchy, breathable, and comfortable but maybe too "sporty"/technical for around town) and the Prana Zion pants (also super comfortable and stretchy but more normal looking).