I'd say CBE is mainly for sound and look. The actual power gain is minimal. The best way for you to decide on a catback exhaust is go out for car meets and hear/see them in person.
Here are the exhaust systems that I would recommend(order doesn't mean anything):
Motordyne e370
Fast Intentions
HKS
Ark
Invidia
AAM Short tails
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09 PW 370z Nismo | K&N Drop Ins | HKS Hi Power | Berk HFCs | Work Meister S1 3P | Project Kics R40 Neo Chrome Lug Nuts | KW V1 | SPC rear camber arms/toe bolts | Southbend Stage 3 daily clutch | Southband 19Ib Steel Flywheel | ZSpeed CSC
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