I have the Carbon Credit and thought it was just average until last night when I was boarding on sheets of ice and it consistently / predictably held and edge.
Overall you like it though? It seems that it's a great overall board, and a few places locally now have it for under $300, so it might be the winner. I'm really leaning towards the Riders Choice now as it's only $75 more, but I've heard it's not for beginners and could ride me around pretty good.
My local hill is almost always an ice bowl, so the manga-traction seems like it's the way to go, but the slayblade seems like a board that I can get a good amount of run on.