Several years ago I made the switch from Zu Wax bi-wire to AZ Satori Shotgun. One of the most immediate improvements I noticed was an improvement in bass presence and control. Like many cable swaps the changes were subtle. I think over all it was a change for the better. Only you can determine if it will be a significant step up. You will surely notice the change more if your room is accoustically treated. This is a change you may want to concentrate on before a cable swap.
-Karl
-Karl