TiRed, that sounds very nice. I presume you’ve seen the fixed frames/bikes on Rourke’s gallery – I especially like the polished rear ends on the 953 frames.
Sugino, Dura Ace or Campag Record (like the blue singlespeed on Rourke’s gallery)? Bottom bracket choice might not be entirely straightforward to get both the chainline right and get reasonable quality sealing on the bearings for road use. SKF would be perfect, but they only do 111mm in ISO taper, not the 109mm required for square taper Sugino or Dura Ace. Royce maybe, or possibly Phil Wood?
Wheels handbuilt probably with the new open pros.
I like Mavic, but I’m not so sure about the aesthetic of the the new rims and the change of the rim depth around the spoke holes, other possibilities might be HED Belgium or H Plus Son TB14 in the grey anodising. More importantly however, shiny drivetrain and brakes calls for shiny hubs – again Royce maybe? (Harry Rowland likes building with Royce hubs). That said, Royce hubs (and Phil Wood for that matter) apparently are not compatible with the best EAI sprockets, although you could always get a Royce sprocket.
Incidentally, there’s no need to go for a track hub for the front, a Royce Ultralite front hub with a Royce QR skewer would be perfect, and I’m sure Cliff will be willing to sell me you a single skewer.