The Open Corsas and Veloflex Pave are very similar IME, but best kept for dry spells or for those glorious days in the Alps or Pyrenees, particularly with a latex tube the closest thing you'll get to a tubular. Next are the likes of Michelin ProRace or Conti GP4000s - not quite as supple but a little more durable. Tougher still are performance training tyres like Krylions or Ultremo DDs - been riding the DDs since winter and whilst they look like they've been fitted by Edward Scissorhands, have yet to puncture. GP4 Seasons are tougher still but ride 'heavy' IME. Gatorskins fit somewhere between the GP4000 and GP4Season.