For $2k on the used market you can find a better speaker than the Celestion, but that doesn't mean you will like how those speakers sound any better than what you already got.
Onhwy61
I agree with this as I have been through it. Kept trying speakers with better pedigrees, looked better on paper and had stellar reviews. But they never made me smile like the speakers I was attempting to replace.
If you go searching my advice is to keep the Celestions as a reference.