I found a NOS Cervelo S1 frameset in my size and at a great discount last Fall. I could not resist its charms and built it up pretty light. Here is the original build:
Brakes: SRAM Red "black"
Brake/shift levers: SRAM Red "black"
FD: SRAM Red "black"
RD: SRAM Red "black"
Cassette: SRAM Red "black"
Crankset: SRAM Red "black"
BB: SRAM Red GXP (ceramic bearings)
Chain: SRAM 1091R
Pedals: Speedplay X-2 w/ Ward Ti Spindles, Al bowties and Ti bolts
Housing: SRAM (Gore Ride-On shift)
Bar Tape: Lizard Skins DSP 1.8
Bars: Ritchey WCS Logic II 42cm
Stem: Ritchey WCS 4-Axis 120mm
Seatpost: Cervelo Carbon Aero
Saddle: Selle Italia SLR Ti rails
Wheels: Reynolds DV46 T UL (removed stickers)
Tires: Vittoria Corsa EVO CX (tubular)
Bottle Cages: Arundel Mandible Oil Slick
Headset: FSA IS-2
Top Cap: Soul Kozak
Spacers: Ritchey branded Carbon
Expander: Extralite Ultrastar 2
And here it is a few months later with a Ritchey WCS C-260 stem, Alligator i-links and a wheel set better suited for bad weather (Chris King R45 hubs, dt spokes and rims and Conti 25mm Grand Prix 4 Season tires).
It's not as light as my Cervelo R5 but it's by no means a boat anchor either.