Hey there, what did you end up picking? I struggled with a similar choice.. we were restricted to picking from the 'Laminex' range....
I ended up selecting the Charcoal in the Riven finish (textured) and have Raven on one bench, with the Fresh Concrete for the Island with a large Calacatta Nuvo 'upstand'. Polytec do some really nice dark colours but unfortunately they wouldn't budge.