In order to give good information regarding upgrading your system, it would be helpful to know the size of the listening room and if you want bookshelf, floor standing or wall mounted speakers. What sort of room do you ha ve behind the speakers if they are floor located and what is the distance to your listening position? After all this is worked out, you can decide if you want box or planar speakers and then you can decide on the other components. If you want to make incremental changes I'd start with a modern digital source as the 1980's cd players tended to be harsh.
