Spoked to Death
Join Date: Jul 2004
Location: Boulder, CO
Bikes: Salsa La Cruz w/ Alfine Internal 8-speed, Scattante Ultegra roadie, Maserati fixie conversion
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Your components need to match each other on at least a few counts. Campy bottom brackets use ISO taper, which won't work with nearly any other cranks. If you are trying to do things cheap, forget about campy, and get a Shimano BB, which will have the JIS taper, which works with other japanese made cranks, like Sugino, Shimano, SR, Suntour, etc.
The other important thing about a BB is how long the spindle is, if you are using the big ring of a converted road double crank, like the cheap and easy to find used 105/600/sora cranks out there, then you'll probably want 107mm. You may need to make some measurements though to find out exactly what you need.
Other components aren't really 'fixed' specific. Make sure your drivetrain parts are all the same, either 3/32" or 1/8". You can use whichever you want, but 3/32" stuff is more available and cheaper.
Choose whatever stem and bars you want, as long as they fit each other, and the stem fits your fork. Choose whatever wheels you want, choose your saddle, and make sure your seatpost fits the frame.
To get a good start, look at the component lists for built up IRO bikes, then if you deviate, make sure you are getting equivalent parts.