So I currently own a 2004 Z. I want to trade it in and get a G35. I owe $9,500 on the Z and I think it's worth about $20,000. I'd like to lease a G for 24-36 months but I'm not sure if I should put that $10,000 down on the lease. I can put it in the bank and earn interest on it or would it be better to put it down on the car? What's the average interest rate on a lease? Weather I put the $10,000 down on the car or keep it in savings I figure it will be gone eitheir way because I'll be taking a little bit out each month to help make the car payments. Currently I'm paying $258 a month on my Z so the $10,000 if kept in savings would pay the difference in the monthly payment over the lease term. Does anyone know what the depreciation value is on the Z? If I sold it in 2 years would how much would it be worth and would I have lost that $10,000. Sorry I know it's confusing. =)

I'm looking for a G Coupe 6MT with premium package, aero, sport tuned suspension, and aero package. This was from the 06 on Infiniti.com but I'd be fine with an 05.