So, last year I got the opportunity to build myself a new bike, and this is what came of it. It's safe to say I'm more than a little happy with the outcome.
The frame is a Ridley Helium SL in 2015 Lotto Soudal colours, which rather happily also matches my club kit quite nicely. I'd normally ride a medium frame, but went with small because I like a relatively big (but by no means pro-level) saddle-bar drop and the Helium has a rather long headtube in a medium. As I was building partly with racing hill climbs in mind, the extra weight saving was a nice benefit too. It also allows me to get a nice low position for riding flatter TTs.
I used a Praxis ceramic PF30 to Shimano converter in the BB which added about 60 grams over using a PF30 BB, but I wanted to run my Shimano cranks so I was happy to take the weight penalty. I spent a frankly silly amount on Jagwire Elite Link outer cable sets, purely so I could fiddle about with colour combinations, but they paid off with the most responsive mechanical shifting I've ever felt.
All told, with the Reynolds wheels, pedals, and cages, the bike weighed 5.69kg with a little still to chop off the top of the steerer. I also have a set of Mavic Cosmic Ultimates with Vittoria Corsa Speeds on that I use for time trials, which bump the weight up to 5.88kg. I know it's not the lightest Helium out there, but my goal was always to build a fully functional bike that was a joy to ride and beautiful to look at (which I think I achieved, if I do say so myself), while still being used in place of a dedicated hill climb bike that doesn't really do anything else very well.
Frame/Fork: Ridley Helium SL - Small
Groupset: Dura Ace 9000 - 172.5mm cranks, 50/34 - 11-25
Chain: KMC X11SL Gold
BB: Praxis Works PF30 to Shimano Ceramic
Pedals: Mavic Zxellium Ultimate
Seatpost: Deda Superleggera - 27.2x350mm
Saddle: Chinese Time Carbon
Bars: Deda Superleggero - 42cm (O-O)
Stem: Deda Superleggera - 110mm
Inner Cables: Shimano
Outer Cables: Jagwire Elite Link (Brake and gear)
Fork Expander/Top Cap: Pro UD Carbon
Bottle Cages: Elite Leggero
Headset Spacers: FSA Polycarbonate
Bar Tape: Deda cork tape
Wheels: Mavic Cosmic Ultimate - Vittoria Corsa Speed G+ 23-25c or
Reynolds KOM rims, Tune hubs, Sapim spokes - Veloflex Extreme 22c
Skewers: KCNC Grooving