Which Campy Ergo/derailleurs go with Shimano 9s cassette--9s or 10s?

I'm building up a new triple-crank road bike and am thinking of combining
Campy Centaur Ergo shifters and rear/front derailleurs with a Shimano
Ultegra 9s cassette and chain, which I understand works pretty well. I'm
going with the Shimano c/c because I recently bought a new wheelset that's
Shimano-compatible (Mavic Cosmos), and it doesn't accept a Campy cassette.
I'm not sure, though, about some things:

1 - Will both the 10s and 9s Campy shifters/derailleurs work with this
setup, or do I need one or the other, and if so which one? Can one be easily
converted to work like the other without much fuss and cost, and if so which
one? It would be nice to go with the 10s so I could move up to an all-Campy
setup in the future and keep these components.

2 - I'm leaning towards getting a Centaur BB & crankset as well, because
they're slightly less expensive, are more esthetically pleasing to me, and
I'd like to make this as close to to an all-Campy setup as possible. Are
these components better than the comparable Ultegras? And do the same
limitations in terms of 9s vs, 10s apply, and if so which versions should I
get?

3 - I've heard that there are Shimano hub-compatible 10s cassettes. Who
makes these, do they work with Campy Ergo shifters & derailleurs, and if so
which ones (i.e. 9s or 10s)?

I suppose that the simplest solution would be to return the
Shimano-compatible wheelset and get a Campy-compatible one instead, which
would allow me to get an all-Campy setup. But I got a good deal on these
wheels and would rather not go through the process of returning them and
paying more for a new wheelset. (I know, I know, that's not much of a price
to pay for a bike I'll be riding for years, but I just want to know what all
my options are before deciding.)

--
Kovie
zen