I can't comment on the new engines (I have an e53) but unless you get a ridiclous deal on a used '07 you are better off getting the 0.9% financing on a new '08. The interest you are paying on a used one will probably give you the same payment on a new at the 0.9% plus you will have it new from day 1. If you buy an '07 you are taking a risk of it having possible problems being it is the initial year of it. Just my $.02.
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