I am not a tire expert (yea don't say he's right)...but this is what I have experienced.....
I put a set of Avon Cobras on back in April of this year...after 10K had to replace rear...at first I thought I was dissappointed with the low milage (only 10K when everone else I thought was getting 14-15k) so June 1st I put on a set of Bridgestones...have about 1000 miles on the stones...
I am not saying the stones are bad...but I have to say when I am done with my 10K trip in July, I will go back to the Avon Cobras...they grip the road a lot better...I think one should use Avon Cobras if they are doing a lot of twisties...but I also think that the Avons Cobras since they grip better you give up a little on the long distance wear (excessive highway mileage in high heat)....
You will love the Avon Cobras in wet weather also...the day I put them on I had to ride home from evansville IN in snow ...they held the road, I was very happy.
Safe Rides..