SWEET! Nickel is really nice
Here is a SIG P220 Carry model in the Nickel finish.

The nickel seems to wear a bit better than the blue / black NITRON finish, in my opinoin.
The only negative I have heard regarding the nickel finish is that selected Hoppe's #9 products and the nickel finish do not combine well if in contact for too long of a time. I do not use Hoppe's products so, therefor can neither attest nor discount the claim.