Keep the STi, get the Nismo too. They're totally different driving experiences.
The Z has a much better interior, better stereo, and actually drives and feels like a sports car. Being N/A, there's not much torque and you really need to rev high to get proper power.
The STi interior and stereo suck, but the AWD is awesome and it's got more torque so you don't have to rev out the engine to get power. Having 4 doors and adequate trunk storage is very useful too.
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-'11 Gun Metallic Nismo 370z
-'12 WRB STi hatch
-'99 2.5RS coupe
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