also if you know of any other things i would need to add on after that turbo upgrade that would be awsome

Turbo : Greddy TD05H
Supercharger : Procharger

Other things you'll prolly want
Greddy Emanage
Then depending on ur boost capacity
2 or 3 core intercooler

expect to spend 10 grand. the FI kit is 6g, tuner + cooler is another 1G then you have to pay for labor and tuning.

turbo's ? no... superchargers - yes ... try stillen ... make great aftermarket products for Infiniti's and Nissan... If you feel that you just must have a turbo kit, try Greddy products ...

http://www.autocarparts.com/c_Infiniti_c_Forced-Induction_Turbo-Kits/