Here's my RS, which I just finished building this morning.

RS 50cm
ID14 fork
Campy Centaur brakes, shifters, derailleurs
FSA SLK cranks
FSA Platinum Pro BB
Reynolds Alta Race wheels
Veloflex Black tires
ITM Millenium stem
3TTT Forgie bars
Fizik Arione saddle
Performance seatpost

All for a grand total of about 16.6 lbs.