I currently own a Audiolab 8000A which feeds Kef 103/4 speakers. I have got hold of a 8000P finally to biamp using the A to drive the highs and the P to drive the lows. My source equipment is a Marantz 63KI. I am wondering if it will be much of an upgrade to replace this with a Audiolab 8000CD. The benefit would be a system of similar looking units. But is the Audiolab much of an improvement over the Marantz? Any other areas I can improve. I am using Nordost Flatline 2 biwire speaker cable. Have an old Audioquest interconnect between amp and cd but have just ordered some Van Den Hul D102 III's. By going the Audiolab route at least I can upgrade as time goes on and add a DAC to the CD or another P later. Even change the A for a S if that is worthwhile (can you still biamp using S to drive highs and P lows?) Any advice would be appreciated.