For the street, I'd stay with the 530.
The 530 is the same pitch as the 520 or 525, but is wider and spreads the force across a wider sprocket area.
Now for racing, sure, go with a 520 or 525 as the chain is lighter in weight.
I measured the 530 chain for my bike and it weighed around 4 Lbs.
The stock final ratio is way high for in-town use.
For the street, a very good all around final ratio is 15F/41R.
I have it on mine and it works great, both in-town and highway.
It makes the speedometer about 7 MPH optimistic, but that can be fixed with a Speedo-Healer unit.