Hey Buckstone
Surprised you find the Sv to run cheaper. I find it the other way around, the zx6r getting a good 55mpg in this weather (more than the sv did), a huge array of cheap parts on ebay, cheap race scrubbed/touring tyres for £40-50 on ebay.
I've done the opposite to you - gone from sv650 to ZX6R. And am loving it too.
Enjoy it mate, fun little bikes they are.