1. When you say $1,800 down, are you referring to the upfront money (bank fee, dealer fee, taxes, title and registration) or a true down payment? If the latter, that means you would be paying the equivalent of $467/month, which, depending on miles per year, is somewhere between too much and way too much.
2. The $4,500 discount is just the manufacturer's incentive. The dealer should be willing to offer its own discount on top of that. Ask for 10% off MSRP. They may not go that far, but that is a good place to start the bidding.
3. What is the base monthly payment without tax? Taxes vary from state to state and are not negotiable anyway so, for comparison purposes, it is better to focus on the base payment.
4. How many miles/year in your deal? These Chrysler Capital leases have an outrageous excess mileage charge of 0.50/mile. With most leases it doesn't matter that much whether you buy miles up front or add miles at the end. With these leases, miles bought up front end up being about half the cost of miles added at the end. Also, miles/year is a significant factor in determining whether you're "getting a good deal."