Modern Campag Veloce uses the stupid Quick shift or Ultra shift mechanism, so you no longer get multiple up and downshifts, just multiple upshifts. It works like Shimano Sora, except even more toys R us as the gear lever is plastic!! No problem-free ratchet on the front shifter either as it's indexed in the QS groups, again just like shimano.
So if I was you, of the three I'd choose 105
My personal choice would be save up a bit and get Chorus. Chorus ergos (which are internally identical to record) really are the best. You can go up 3 gears and down 10 in one lever push, parts are readily available if they break. It might make sense to get chorus or record ergos and veloce everything else to save some cash as it's only the ergos that are toys r us below chorus