IMO, a lot would depend on if you wanted looks or just something durable.
On that gun, I may be forced to keep the slide blue/black unless you want to change the front sight, being staked in. A silver front sight loses contrast and gets hard to see under certain conditions.
No votes for a two tone finish?
Having seen a few 1911s in electroless nickel, I think that's a classy look, at least to my eye.