Please see the K04 manifold thread, I have got Richard from developments replying today.
Bill, as I said it would start an argument ;) I was only joking - I remember them on SCN! Hehe, is it not all about having a good time?! Most people think not :(
Anyway! Personally I think they are both very good manifolds :) But as there is not too much in it all I would go for the one that looks the best. Call me one sided but I do like the look of the RMR :)