I am building a flat bar spesh allez at the moment,
Costs so far
2010 Allez sport frame, Fork, Headset, Seat post, BB & Brakes £180 – eBay
Shimano R500 wheels. £140
Stem & flat Bars £10 of a mate.
Cables £10
Tyres £45
Single speed converter & Cassette £19.99 Onza eBay job
still have to get a crank, chain, brake levers & a seat
Cost in total, £405 nearly the cost of a new allez already :(