I would say about a 2k difference from New to Used is typical. Also, you will get a better deal on an 09 then a 2010, especially if the dealer has 09's still on the lot.
You can negotiate anything you would like. You won't know unless you ask!
From what I am seeing Z's going for I would say you are going to pay a 3,000.00 difference in choosing a 09vs.2010
Personally the 370 is light years ahead of the 350 imo
Hope that helps a little.
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