Okay, after ringing around, we've found that the $170 ones still were the cheapest, (it included putting them on, balancing them and was an extra $50 for alignment) even though Kmart offer their 10% price beat guarantee, it's only on tyres they stock and the cheapest they had was $220. They wouldn't price match with the Tyre Factory because they didn't stock the same tyre. We've looked up the tyre that's been recommended and its known as Australia's best value for money performance tyre. The car is booked in for tomorrow, so I guess time will tell.

Thanks for all your help