I currently have the same preamp and amps and went with Sonus Farber speakers. I would stay away from KEF or any other company with metal tweeters. I had KEF Reference 5’s and they hurt my ears even at lower levels. I tried a couple of other speakers with beryllium tweeters and had similar issues. With the SF use soft dome tweeters and it’s made a world of difference for me.
All the best.