When I was upgrading my bike focusing on lightness (my '73 with a 3.2 is 2174 lb, so I'm a bit of a lightness freak), I found these wheels that seemed to get decent reviews on forums:
Yoeleo Tubular Wheels
I shaved 4 lbs off my older carbon fiber bike to get it down to 18 and have been thrilled with it ever since. Cranks, pedals, handlebar & stem, seat post and seat.
30 years of riding on and off (way more off than on), I had sew-ups and always loved the feel over friend's clinchers. This bike I have has fairly old Mavic Ksyrium wheels with new Continential Grandsport Race tires. Even with a ton of miles on them, I just can't get used to the feel (or lack thereof) and am considering the Yoeleos again, or a set of aluminum tubulars.
On carbon fiber vs. metal, CF is unidirectionally strong and relies on weaves to achieve equivalent 3D strength to omni-directionally strong metals like steel, aluminum, titanium, etc. Mr. Ahab can certainly speak authoritatively on the subject, I only worked for an early 90s pultrusion company making CF parts for the Stealth Bomber, hockey sticks for Bauer, etc. and picked up a few things along the way.