Another vote for the Nemesis. I have 2 HCigar clones in SS/Copper and they are spot-on.
I know it seems like the Nemmy is the "default choice" but there's a good reason for that.
Great all round mech. Can recommend VapeGeek as an excellent vendor too.
Copper is allegedly better for having less voltage drop but, realistically it's unlikely you'd notice any difference.
Brass and Copper both tarnish quite easily but I like the patina you get on them.If you like your mods to stay super shines then steel is an easier option to look after.
Copper threads can be on the soft side but I've had no issues with my Copper one, threads are like silk.