This is the one I went with:
Bayspeedaerokit.com Nissan 370Z BS Carbon Fiber Hood
Unfortunately I can't answer how well it'll be in all weather conditions. It's done well in the sun and had a small rain shower fall on it but nothing more than that. Only had it on for about 3 weeks now but no complaints.
Here it is after modifying it a little:
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SpinTech Mufflers, Airaid CAI, JBA H-Pipe, Lethal Performance Over Axle Pipes,
MMD Quarter Panel Louvers, Cervini's Ram Air Type IV Hood, Carbon Fiber Radiator Cover, GT500 Rear Valance, Quad Exhaust Tips