I'm new to this forum but I just wanted you to know that I used Campy Veloce shifters and der with 9 sp Shimano 105 cassette and hub. It worked fine for approximately 10,000 mi. I don't think the shop even used spacers. The only reason I switched is because I upgraded to Campy 10sp last week. The old components were switched to my trainer bike because they are still going strong. Goretex cables made the shifting smoother.
Kathi