Your current speakers are pretty good. Maybe consider getting a nice active preamp instead.
"Looking to spend no more than $2500 used. Are the speakers the weakest link or does the power amp need changing?"
The weakest link will be determined by your personal taste and how well you match your equipment. Any piece in the system can be the weakest link.
With your current system, is there anything you are trying to fix? Something you're unhappy with? If there is, that will help a lot with recommendations.
"Looking to spend no more than $2500 used. Are the speakers the weakest link or does the power amp need changing?"
The weakest link will be determined by your personal taste and how well you match your equipment. Any piece in the system can be the weakest link.
With your current system, is there anything you are trying to fix? Something you're unhappy with? If there is, that will help a lot with recommendations.