15" Avon CR6ZZ compared to 17" performance tires

[Pman1961]

I have about made up my mind to replace the 15" wheels with 17" wheels and performance tires. Possibly the Nitto NT05's. 600+hp can not be fully appreciated when your tires offer unsatisfactory traction. I currently have 7 year old Yokohama Avids. First gear is useless, second needs to be feathered. However, I prefer the look of the 15" rims and taller tire sidewall. I have been spending so much time reading about tires on the Internet my girlfriend thinks I'm up to no good! My question this thread. Will the 15" Avon's provide similar traction when doing a spirited run through the gears compared to 17" performance tires? I'm sure the 17's are better in the turns but I'm more of a straight line person. Again, I'm not opposed to go 17's. I would like to know if anyone had experience with 15" Avon tires and changed to 17's along with their comments. Another concern is I feel like Avon will offer the 15" tires for the Cobra among other classic cars for many years to come. I hear chatter about the offerings of the 17" wheels are becoming more and more limited.