I am currently deployed at the moment, but I was able to purchase my very first Datsun 280z a few days ago.

Seeing as this is my first sports car and that I'm new to the game I was hoping I could get some ideas on what kind of catback exhaust I should order so that it will be ready to be installed once I return home.

There is nothing wrong with the current exhaust other than some fumes that leak into the interior. My main goal is to get a performance increase and improve the look and sound of the car.

A couple options here:

http://www.thezstore.com/page/TZS/CTGY/classic19

I'm using this one:

http://www.thezstore.com/page/TZS/PROD/classic19j/15-6308

I hate to tell you but z-cars have a reputation for exhaust smell in the cabin.  You may find that very difficult to get rid of.