Consider Michelin Protek with the 1 mm protection. Very quiet, smooth/comfortable riding tire with good grip and feel, even when fully loaded. Longevity is still in question, but no complaints so far (~500 miles). I'm using the 700x40c (622-42) @50psi. Panaracer Tour should be on your list too, especially if you are on a tight budget/want a lower cost alternative.