Oh boy ... read every post. I'm just not seeing the wisdom of spending $1K to 'upgrade' the o.p. wheelset for any reason. Certainly not with a new wheelset and buying used carbon wheels is ... well I wouldn't do it. But used is about the only way the o.p. is going to get wheels significantly lighter than the OEM under budget. The Roval wheels that recent posts mentioned are not significantly lighter than the OEM Syncros RP 2.0.
The last time I had this kind of weight weenie wistfulness, luck was with me. I had recently taken a plane trip for a family funeral. The passenger next to me was about as sick as a person can be and still stand. Three days later, I got about as sick as I have ever been in life. Running 104°F for over a week took me from Clyde territory 203lb to a roadworthy 185lb in less than 2 weeks!! The Flu™ has got to be the weight weenie on a budget (under $500 Domestic Airline ticket) speed secret of the decade. FWIW.