In need of advice on speaker choice

I have a Yamaha M2 amp with a C85 preamp and am looking for advice on pairing speakers with it. I see a pair of Keff r900's for sale at $2,500 but have not listened to them yet. I have another system with JBL L-65 speakers which I love.
There are so many options out there and I don't know enough to make a good decision. I am looking for used but do not want to spend more than $2,500 for a pair. Any help would be greatly appreciated!!