At the moment on my 09plate I'm on a set of ognibene silent sprockets with matching trofeo chain. Impressed so far, very quiet (saying that most new driveline kits are compared to your old ones) only done about 1500mls so far, didn't stretch to much from new so as yet pleased. Got them from biketorqueracing at a good price as they had a deal on at the time.

Oh forgot to say, I have currently Pirelli diablos , but normally have Avon storms, but I normally see what's on offer, I think both are around the £150 a set (front and rear) from M&P currently.

But what if it's ice cream instead of pies. 

On a more serious note....when I've got my panniers fitted and filled with a a few tools and waterproofs etc it makes quite a  difference. 

https://www.biketorqueracing.co.uk/parts/chains-and-sprockets/chain-and-sprocket-kits.htm?make=kawasaki&model=kle650 versys&year=2007

I'm a big fan of Afam chains.  I've twice tried DID and twice I've been less than impressed.

If you really want to spoil the bike and get a chain that'll last and last go with Tsubaki. 

 Agreed  .

 Interested in your comment about rider weight. We hear endless discussions of how to shave a couple of kg here or the manufacturer's wet ( or is it dry  ) figures there, but we tend to conveniently ignore the rider weight factor which can easily vary by 50 kg from one rider to another. As you note, even a litre bike is going to notice that kind of difference.
 Chances are that the cheapest way to make a marked improvement in a bikes' performance, particularly smaller displacement ones, is for the owner/rider to shed some weight, rather than change the can, re-map etc.

 Looking forward to the next installment  .

 Rob.