I have been using vittoria radonneurs on my touring and commuting bikes for a couple of years now and have only had 1 puncture in that time - they would be a top choice. I have ridden them both on and off road, loaded, wet weather etc - although I do not think they do a folding version. Continental also do a slightly thicker walled tube often branded either as "tour" or "quality" series. These have been a good buy also.