I getting a CB450 today and am already looking at some mods. First off... the seat. I was looking at Brets' 500, and i love the single spring seat. Where would i find this or how would I make this happen on my bike? Are there any cons to that style seat... because im torn between that style and the traditional fiberglassed back seat. I figure they will both cost the same so thats not an issue. Any advice? which seat would provide more comfort in the long run?