+1 for the Panaracers. 26x1.75 or 26x1.5 (my favorite). I have had good luck with both the Pasela and the T-Serv, but I always run with Mr. Tuffy liners. I also had a set of Forte tires once upon a time, can't remember the name, they had a funny tread design but worked well. Looks like Nashbar sells them as the Transition tire.
I can also say NOT to get the Serfas Barista tires. Too thin, too expensive, and riding a rigid MTB with 100psi 26x1.25 tires is... a little rough.
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--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7