I don't think you're going to be able to haggle on the residual. Residual values are usually set by the leasing company and they can be a real crap shoot for them. Chrysler is on the shakiest ground of all the domestics. Any lender doing leases on anything they make has got their ass hung out in the wind and that's why you're being quoted the payments you're seeing.
My wife is driving a 2008 Aura on a 36 month lease at $270 a month. The car is due to be turned in this October. M&I is sending us letters twice a month asking if we want to purchase the car. When Saturn went away, the residuals dropped like stones. They don't want the car back - they're going to take a bath on it.
You need to get the net cap cost down. Which means you've got to get the selling price down. As was said, visit other dealers and pit them one against the other. You're not going to get the payment you desire without throwing a lot of down money into the deal though so be aware that you're probably wasting your time. How many miles do you drive in a year? That can make a tremendous difference in your payment.
Cars depreciate at an alarming rate. Why anyone would ever want to own one is beyond me. I'll gladly pay to drive one for a period of time in which it's fully covered under warranty and turn it in for a new one. I'll pay less in the long run when you factor in maintenance and repairs.
Never lease to buy. If you want to own the car, buy it up front.