I faced the same question myself, and chose to go invest in new tubular tires since the wheels on the bike were "perfectly good". That turned out to be misinformed since the rear cassette body died shortly after necessitating an expensive ebay purchase to stay with the same wheels, then the rim bent. in the end I spent more to keep the old tubular wheels than i would have spent to purchase decent clinchers. To add insult to injury, tubulars are really a PITA to deal with. I've patched and replaced more tubulars on this bike since I've ridden it than all of my other clincher bikes combined. In spite of it all though I'm not sure I'm sorry I stuck with tubulars. I really love how this bike rides and I think a part of it is the tires. If it were my only bike or even my main bike I'd probably switch to clinchers, but I've got others to ride when this one is down, and I like it so much that I also ride it more often than all my other bikes combined, so maybe it IS my main bike. I could always swap the wheels off another bike to ride it with clinchers, but for some reason I never do.

I guess I'm thinking you should try riding it with tubulars if you can, but for every day use, you might want to throw on some clinchers.