@Anonymous You have received lots of good advice and I echo much of it, especially to never put money down (capital cost reduction) on a lease. If you want to pay taxes, acquisition fees, registration fees, etc. up-front that is more advisable.
The current unknowns are Residual Value (RV) and actual Money Factor (MF). To evaluate how good your deal is you should find out the RV and MF as well as current incentives for your zip code; the best resource for finding this info is the Edmunds forums.
My very rough way to evaluate a lease is if the payment is 1% of MSRP, anything under that is a good deal, over I would pass. That being said, I usually use a 36mo term and 10k miles as the evaluation. COnsidering the down payment, extended term and reduced mileage I would say your deal is fair. It is not good and far from great, imo.
