I remember back when Adcom first came out. I had Adcom's top of the line 555 amps running in mono with their top of the line preamp. The speakers were Definitive Technology BP-20's, their top of the line at that time.
I bought a Krell KRC-3 preamp and KSA-50S amp along with Dunlavy speakers to replace the system.
For grins, before swapping out the Definitive Techs with the Dunlavys, I hooked up the BP-20s to the Krells. I never heard the BP-20s sound as good as they did then!
If you want to upgrade, leave the speakers alone for now.
Chuck