I say go for the Z build..... because you can. I'd go for lightweight and balanced instead of all out power though. Maybe use the 370Z Nismo RC as your inspiration, but with a bit more grunt.
There are plenty of body kit's around, or if you're truly dedicated, have a custom kit made. Find a good enough shop and they can pretty much make anything for you want in the visual department. I kind of like the 'sleeper' look though.
These look pretty bad-*** too.
