2010 Roadster here with no top concerns, 18,500 miles on it. I have the top down daily. Don't let a few folks bad experience sway you from the model you want.
Based on what you've said above, a touring 7AT is the way to go. And if you're worried about the top, get an extended warranty on a certified pre-owned. Not sure if it covers the top, but worth a try. Good luck in your search!
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2010 370Z Roadster, Touring 6MT, Pearl White on Black, FI CBE 
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