Marantz does not currently have the "high prestige/great performance" reputation that it earned in the past. However, with design & oversight by Ken Ishiwata, they have created a gem in their top-of-the-line preamp. Before you invest big bucks, you should listen to the Marantz SC-7S1. (I am not involved with Marantz other than as a pleased purchaser,)
info- http://us.marantz.com/Products/646.asp
info- http://us.marantz.com/Products/646.asp