I was also in the position a couple of years ago, trying to decide whether to get a Z06 or a used porsche. I know guys at work who have those cars (some have vettes, some porsches) and I was seriously considering looking for a slightly used '07 Z06 or a 3 year old carerra 4...
Instead I got a baby boy, and recently bought a nice sensible 4-door sedan to replace my firebird. I couldn't resist though, so instead of a sensible chebby malibu or something like that, I got a pontiac G8 GT. 361hp on 87 octane. People are getting 290-300hp at the wheels bone stock on 87 octane, and over 340 with nothing but a cold air intake and ECM tune for 93 octane gas. And that's just the 6.0L GT... The GXP model is running a full-up LS3 motor putting out well north of 400hp, still on 87 octane.
Yea it's a 4-door sedan but it's nearly as quick as my firebird and it handles better, even considering that it weighs almost 800 pounds more. My first mod will be a trailer hitch

I'm going to hold off on the airbox and ECM/TCM tune until I'm positive I'm not going to need powertrain warranty work, maybe in a couple of years.