I must say 370z.
more bang for your buck assuming you are buying a new 370 or a new corvette.
corvette coupe msrp is 49000 brand new. for that you get 430hp and 26 mpgs. that is with no upgrades. fully loaded is alot more expensive
The 370z makes 350hp and it is $10000 cheaper for the loaded nismo version. The 370 looks better, better built, and better interior.
I think $10,000 more than makes up for 80hp.