If your tires are tough enough you can run pretty much whatever kind of tubes or liners without much worry. I run Vittoria Randonneur Cross tires. Not as harsh of a ride as you'd expect from some pretty tough tires. I think they're a good compromise between a nice ride and durability. I'm looking at less-tough Michelin Pilot Sport tires. 20 bucks says I flat out like crazy and run right back to the Crosses... as stock tires I may be taking them for granted.