Based on your comments/needs, I would consider the following:
1) Keep the stock headers and cats, the aftermarket upgrades don't give you a ton of power, but do make things quite a bit louder.
2) Consider a good resonated cat-back exhaust. It will give you the max power without the max sound. The Fast Intentions 12" and 18" resonated exhausts are extremely popular for the 370z and are very high quality.
3) Get a Stillen Gen 3 intake or similar (ones that go in front of the radiator). Taking off the front nose to install it is not very difficult and after the first time you do it you will wonder what the fuss is about. The aftermarket ones that stay in the engine bay don't make as much power and some will actually lose power once heat soaked.
4) Consider a small oil cooler (Z1 motorsports makes a nice kit).
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