About the Kumho's stretching, I didn't mean that they aren't able to be stretch as much, I just meant that they won't appear as stretched as a normal tyre, from what I have heard anyway.
Option1Garage up in QLD have great deals on all of Kumho's tyres and Federal tyres. Postage to me (newcastle, nsw) was $28 for a pair or $40 for a set and came in 2 days. Excellent service. The prices of the sizes you want aren't on their website but just send them an email and they should get back to you quickly.
http://www.option1garage.com.au/