needs some help with parts

[gingerismy350z]

i recently bought a 2004 350z and im trying to find the best set up.

first turbo or supercharger? which is better for this application?

second what is the best differential set up i can do?

third is there any other susp. set up better then tein?

thanks for the help im just gettin started and have been driving a 240 for practice and i have my own car now.

thanks again to anyone who can help me out