Atomic, Zenith and Mephisto can all run single coil and IMO are all excellent choices. I'm pretty sure they can all be had with Brass, Copper and Black AFC rings.
ETA
I can't think of any off the top but I know there's some RBA's that are SS which are coated with Brass, Copper, etc. Do some research if you want something that's looks like all copper. I know the Stillare is SS with copper but it's not made for single coil.