the SL55 is very impressive, a 911 is a nice car as well. I personally like the Z8 though. No one doubts either of Stuttgart's super sports the SL55 and 911, either would be great.
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If you had to choose from the SL55 and the 911, you'd be better off with the SL55. It's adequately fast, but still comfortable. But if you can, go with a Z8. That car is really different and, in my opinion, going to be more enjoyable to own.
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