Hey everyone, I am looking for new tires for my '03 Cobra. I think I have decided on the Goodyear F1-GS-D3's. First question, are these actually good tires? Second, what is the cheapest you found them for the size you purchased? And third, What size should I go with? 275/40z-R 17 98Y VSB or... 275/35ZR18 95Y VSB. I know absolutely squat about tire sizes, what do you recommend and whatever other comments you see fit. Thanks.

Jarryd D.