If you keep a Viper 4+ years they depreciate a lot less than your average car. Leases tend to be based on normal depreciation. You would probably be better to take out a loan.
Http://capitaloneautofinance.com (ex-peoplefirst site) quotes $72,000 loan at 4.25% 60 months at $1,334.13 a month. Assume it is a $45000 car (probably more) at the end, then $750 a month of that comes back to you for a net of $584.13 a month. Take the loan and have an asset at the end.
Best advice on money I got when I was younger was " Live on last year's income not next year's". Not meant as flame ,just the reminder I needed then.