I have been using Roval CLX 60s for my race wheels for about 2 seasons. They have seen me to a number of wins, including mountain-top finishes and the only flat I had on them was Catskills last year where I went into a murderous pothole.
That being said I did decide to go with some tubular 40mm deep FFWD wheels. But they have yet to arrive. I like the idea of Tubulars for a REALLY serious race (Queen stage on a Stage race, State Championship RR with hills, etc.) but aside from maybe 3-4 races a year where I think I will be doing alot of accelerating and / or the roads are horrible and are very high risk for a pinch-flat I would just use carbon clinchers.