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I got the GT500 spoiler a while ago, but I wanted the Rousch one at the time. I say that if you like the Rousch one better, then go get it. I may end up changing mine out to that one in the near future.
Between the two you mentioned, I guess the GT500 spoiler, but only because it's cheaper. Most spoilers look like too much plastic to me, and remind me of the stupid **** they do on ricers. The no-spoiler look, and the newer (07-09) V6 spoiler I think most closely match the design of the car.
I have a question for the GT500 guys. I have a GT with the stock spoiler and the Sirius antenna mounted underneath. Did you have to relocate the antenna or does it fit behind/around it?