Im a tax "expert". at least my hat says so. I tell most of my clients your looking at a 6 on one hand half dozen on the other. Leasing may have a slight tax advantage because of the luxury car depreciation limitations. While from a business standpoint it has its disadvantages. I hate to see people pay & pay and never own anything. Try the below site for a detailed analysis of your particular situation.
http://www.youngmoney.com/calculators/auto_buying/auto_loan_comparison