You have a well balanced system. If you want to improve the system you will probably have to upgrade as a system and replace most of your components. Rather than replace any components, explore careful system setup (speaker position, clean connections, dressing your cables, etc.), room treatments and/or a high quality equipment stand. Beware of spending big bucks on interconnects/cables/power cords. These products can make a very positive difference in a system, but most audiophiles over spend on these items.
Need upgrade advice
I would like specific suggestions on what component to purchase to upgrade my music system to sound more realistic or musical. Current system: Audio Note AN CD2 compact disc player, Linn Kairn preamp, Linn Klout amp, Magneplanar 1.6 QR loudspeakers. I am not unhappy with my current equipment, but I would be interested in learning what I could purchase to improve the sound of music.