Hi Roguedog,
I use mostly Vredestein tricomp slick (700x23) for clinchers, and Tufo elite ride 23 (700x23) for tubulars. On my time trial bike I have 700x20 clinchers: Vittoria open corsa evo cx.
The Vredestein are fantastic tires, and very puncture-resistant. However, I like the feeling of tubulars, so the Tufo's are my favorite; very stable tires, great traction with our variable conditions (wind and flying sand one minute, rain the next), and the sealant prevents small punctures from ruining your day