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I've seen Campa 10 speed shifters+derailleurs used with 10 speed shimano cassettes and work perfect, but they only work in certain shifter/derailleur combinations (like here http://forums.mtbr.com/drivetrain-shifters-derailleurs-cranks/10-speed-ultegra-cassette-campy-derailleur-382247.html).
Or you would (indeed) need a travel adjuster/adapter like a Shiftmate 1 (look at chart here http://www.jtekengineering.com/resources/shiftmate-compatibility/) which is pretty easy to install..
If above options are not for you, then just get Campa stuff
Thanks again (everyone).
Just to make sure I'm not inferring something weird here, I plan to use Chorus shifters. Barring modifications and travel adjusters and the like, this would necessitate a Campag cassette (and therefore freehub), right?