just to update. i rode my friends Corsa tonight about 20 mi. i loved it. it was so comfortable. I think that is the way i am going to go for sure now. now can anyone tell me the advantages of having the 700 tire over the 650? his was a 700 but all my bike shop has is the 650 ones. Didnt know if it would be worth it to wait for a 700 version of the Corsa or not?