Maybe I'm in the minority, but I rarely get punctures on tour since I'm likely on small back roads away from cities. That's why I don't see the point in using heavy touring tires that ride harshly. The Schwalbe Marathon Supreme @ 490g for the 700x40 seems good, but the Rene Herse 700x44 Endurance casing @ 425g would be my choice. Neither of those options are cheap though. But I'm willing to shell out money for comfort and performance where it counts.