VFM: Connect:AMP with existing Wharfedale or getting a Play:5

I am new to Sonos so forgive me if this has been asked before.

I am planning a new system. My old speakers (Wharfedale Diamond IV - perhaps 10-15 years old) have served me well (with my NAD CD system I am throwing out) and still work.

Is it worth just chucking those and getting a Play:5 (£350) or for more or less the same money (£399) get a Connect:AMP to drive the old speakers?

Any ideas?