The link shows 17x9.5 @ $1920 the lot plus if ur not in SA add $100 = $2020
This group buy you get 18x9.5 @ $1550 plus to get all that he is offer would cost:
4x brand new 235/40/18 @ $480
Fitted and balanced all 4 @ $44
Wheel & Lock nuts @ $50
Total - $2124 plus if ur not in Melb add $100 = $2224
I know this coz i use to work at a wheel joint 2 years ago.
TAKE ALL THIS INTO CONSIDERATION, before u make ur choice. Your paying an extra $200 for bigger wheels and tyres plus 17's are gettin old, no offence to anyone.
Also you have about a dozen colors in choice.
If you like the deal then go for it,
if not thats your choice your money
Simple as that.