I currently have Vittoria Randonneur Pros. They've been fairly good but I'm disappointed in the short life of the rear tire (1500 miles). Also there have been times when I wanted a bit more tread on gravel roads. I never had a flat with them though.
I ride 95% paved roads, but they tend to be back roads, sometimes in bad shape, sometimes with gravel sections. Occasionally I'm tempted to go a short distance on a flat path in the woods.
I was looking at the Continental Touring Plus Reflex. The tread looks a bit more aggressive than the Vittoria Randonneur, but people complain about the stiffness of the ride and say it's very hard to install.
So I'm looking for a rugged tire that could handle a bit of gravel, but will reasonably low rolling resistance, and good puncture resistance. My budget is under $40 per tire (so the Schwalbe Marathon Supremes are out).