The current Centaur chain is the same as the old Chorus 10. Veloce is nearly the same chain, just a few grams heavier, with no holes in the side plates. The smart thing to do is buy them from Europe and buy all you will use for 2-3 years at a time.
Just about any brand of 10 speed chain will work fine with Campy 10 drivetrains, but Campy is the only brand that I've found with very low elongation. The other brands will elongate to .5% in 2-4,000 miles of use. Campy chains still wear out, but they wear differently.
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