I need new speakers to go with my old but serviceable system

My existing system is about 20 years old but still working well. The speakers are Wharfedale Diamond IV and are sounding shrill to my ears and due for replacement. The remaining kit is: Rega Planar 2 T/Table, Sony Tuner ST-S370, Arcam Alpha Amplifier, Technics Cassette Deck RSBX 404, Technics CD Player SL-PS670A. My speaker short list is: Tannoy Mercury VI, Boston Acoustics A25, Dali Zensor 1, Wharfedale Diamond 121 and Monitor Audio Bronze BX2. I listen to classical, jazz and speech (radio). Any advice gratefully received!