Mike,
The Demented has a progressive rocker, not a three stage rocker, I think that helps it to be a faster board. Check this link to get an idea of the style of boards I rode before the Demented and what I thought about it.
http://www.wakeworld.com/MB/Discus/messages/1/84389.html As far as the bindings go, they will fit just fine.
O'Brien has the Cirrus core for their light weight high performance boards. I like it better then a wood core board because it won't take on water if it gets a ding in it and it's just as light if not lighter than wood.
Check it out if you get the chance. Whatever you pick I'm sure you will like it.
jjakober