I was in goodfella's car recently, he has the KU31s on, and they stick like [smelly brown stuff] to a blanket!
235/45R17 will be cheaper than 225/45R17 because it's a more popular size (common on Falcons fitted with 17" wheels from the factory for instance). The difference in rolling diameter is minor, nothing you'd need to be concerned with.
Check out Option1Garage's prices on Kumho tyres, they're pretty damned competitive, even after shipping. There are some other places I've heard of quoting one price on the phone and then demanding more money when you actually turn up.
Also, no matter where you buy, check the age of the tyres - learn to read the markings on a tyre, and don't accept old stock. Rubber goes "off" with age, and anything too old could give you bad grip.
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