If I were you Id look for a complete. Custom builds are almost never cheaper than buying a well priced setup. Oh, and I live in Oxford. I ride fixed daily. I picked up my 2009 Langster 3 months before the 2010s came out for $500 from Oxford Bike. Its a great ride with quality parts and is wicked fast. Remember, you have one gear, every bit of weight you can save is going to help and you will feel it much more so than you would in a geared bike. So you can build your bike custom sure. But its going to be heavy, middle of the road parts, and no warranty to speak of. Put that up against aluminum frames, carbon fiber fork and seatposts, sugino messenger cranks with a warranty and I know which one Id pick.