The Suma Cinny is very dark but I think the Abyss (Suma GHI) might be darker. I saw the prior in the flesh a few years ago at Tinley and there was still a hint of dark brown to it under the right light.

Give the trend I would guess that Suma BlackHead and Suma Chocolate will have the potential to be very dark as well. I would also bank on any of the aforementioned single genes making something dark when in combo with the SuperCinder