Why get something else you're not happy with just so that it's not 2 steps? As for the colors, black and plomb are different but both very dark. Me, I like dark bags over light bags but if you might like jaune or ivoire, maybe you can look at them irl before buying to see whether the light colors click with you?
I love the Step and the colors you mentioned so I say go for it!
I love the Step and the colors you mentioned so I say go for it!