A better compromise, IMO, are the so-called "open tubulars" like the Deda Corsa RS or Vittoria Open Corsa CX. These are clinchers that mount on clincher rims, but the tread side is built like a tubular. They have a high tpi (threads per inch) of 290, and you can run a high psi - up to 145. If you ride-compare them side by side to other tires on the same bike/wheels you'll never run anything else - if you can afford them. They're not cheap and they don't last very long. Here's a couple of links:
http://www.cyclingnews.com/tech.php?...datre_rs_corsa
http://www.bikeforums.net/archive/in.../t-378247.html
And here's a cut-away pix:
