Thats 2 sentences. FACT: The STI is an impreza with upgraded suspension/aero/wheels/engine. The bear bones of it is a commuter car/grocery getter! The 350z was designed FROM THE GROUND UP as an actual sports car, with all the DNA and heritage of a long line of Z cars. I think the Z is a much more refined experience than the STI.

Sounds like you want the mod friendly ugradability of an STI, and the panty dropping power of a Z -- Just go get a C6 and be done with it.