Honestly, I'd rather use all Shimano or all Campy. I've never subscribed to the mix & match theory.
I just completed a bike using this setup (campy 10s shifter-shimano 9s parts elsewhere) and it works pretty well. You have to compromise and have it slightly misadjusted on either the low end or high end of the cassette, but it'll shift flawlessly in most gears. Just choose the end you don't ever use anyway because of the gear ratio overlap and it hardly matters.
(By the way thanks for the advice in my MTB thread)