My car should book for 20k trade in. considering this I wantedto put it towards the lease of an m5. then buy it outright in 3 years. does anyone have info on this matter. whats teh total price teh new m5's are going for. and how long is the wait for. whats the residual value?. also i heard bmw has a special lease/finacnig deal that after your total 3 years of lease they let you pay the differnce to buy it.