gatorskins seem a bit overkill for this type of riding - esp fully supported.
i'm a fan of the conti gp 4 seasons - they are a bit softer than the gatorskins (from my experience) and roll a bit smoother. still plenty tough - as i ride gravel, dirt, and pavement here in VT.
I did a cross country ride with America by Bicycle in 2007, using Specialized Armadillo Elite 23's -- had only one flat -- and I've never used anything else since. Well, I take that back -- I'm using their 25's on my rando bike. Great tires.