IMO, you can't go wrong with a vintage style strap. They're all I've ever used. I would say black to compliment the headstock and ebony board. Having the same concern, I once ordered a custom vintage style strap. I measured my standard length and had the maker just make the strap one piece, non-adjustable, no buckle. I used Medina, but I'm sure any custom strap maker could oblige. It was only $40 from Medina, but that was 10 years ago.