Chains and quality

So time has come to replace the chain and sprockets on my 'non triumph' commuter the Chinese wk650 tr. it uses Kawasaki parts mainly (there is a thread on it somewhere)
What would be value for money and middle of the road chain these days as I've not changed one in decades? I'm not wanting cheap nor oversize either just a recommended sensible brand.

 

I see you've been doing my homework! Cheers Dave.
It's a 520 but rear sprocket is six bolt 46 teether rear not like ER6 which I thought it might have been.