Have you thought about Falken FK452's? They have rave reviews from loads of forums (and me) and are simply outstanding value for money. Wear seems to be average but the grip is outstanding for any money let alone what they are selling for.
For some reason the 18's are cheaper than the 17 so an added bonus for you.
I'd love to hear a comparison of the much loved goodyears vs the falkens from someone who's had both. I'm willing to bet there is nothing in it / Falkens come out on top considering the coin.
Just food for thought.