A solid state amp like this rated at 150W into 4 ohms and 90W into 8 ohms are going to drive most speakers. You will get many recommendations in this price range for KEF but I'd probably be scanning the used market and considering something like these Harbeth C7ES3 small standmounts. Lots of personal taste and options to consider.
https://www.usaudiomart.com/details/649609091-harbeth-c7es3-speakers-with-skylan-stands/
https://www.usaudiomart.com/details/649609091-harbeth-c7es3-speakers-with-skylan-stands/