My Merckx (57cm not sure on the tubing) is 19lbs 15oz with mostly 9 speed Dura Ace. My Duel (58cm believe it is Brain) is 20lbs 5oz with 10 speed Centaur. My Puch (58cm SLX) weighs 20lbs 13oz with Chorus and Veloce and pretty hefty wheels. You can see all three in the link in my signature below.
None of these have any real weight weenie parts except the saddle. I could get them all under 20lbs with some different wheels.
I am building up an 853 frame with threadless carbon fork right now. Veloce/Centaur mix and I believe it will come in at about 19.5lbs
Jake