First off, yes I did several searches, and it didn't help. So, getting that out of the way...

What's a good tire for general road touring, that I can also use to hop onto grass or ride on dirt trails (nothing technical, comrpised mostly of good ol' Long Island well-packed sand and gravel). I'm looking to get a Volpe w/ fenders, so probably 35-37 mm width would be max. I would probably switch out these tires for something like 32 mm Schwalbe Marathons for (somewhat) faster centuries and such. Is something like a Panaracer Pasella/ Conti Contact/ Schwalbe Marathon ok for this type of riding? or should I go w/ something w/ more bite like Marathon XRs or Conti TravelContacts?