Component compatibility help! Cannondale R1000 CAD2 frame
I am a student and wanted to get into road biking for less, but may be in over my head already. I got ahold of an old Cannondale R1000 CAD2 frame w/ carbon fork, wheels, sprockets, and fancy shift handle brake combos all in good condition for cheap, but I am sans derailleurs and brakes. Besides the rear derailleur hanger that I am told will be near impossible to find so i might just make, which more modern components will fit, and what determines whether they will fit? The rear wheel has a 9-sp cassette and there are three sprockets in front. How about the ultegra series (though there seem to be many different models)?
Thanks, I am a little bewildered.