Car Woes

So how expensive would it be to rent a car for a few months? The problem. Our plan was to lease a car for another three years. We did budget for the monthly payments of around $240 per month. What we did not budget for was the $3700 down that we paid last time. Opps!
Our options are lease something lease expensive or finance a used car.

Quotes to date for leases:
Minivan midlevel -$379 per month; plus inception fees (15K per year for 3 years)
Minivan base model -$259 per month (additonal $12 for 15K); plus $2400 down plus inception fees