Priced a car at the dealer...he's giving me the following deal

24 mo/10k per year (i dont drive that much)
MSRP 43870

Residual 78%
Money Factor .00200
Selling price 41745 (2125 off MSRP)
512/mo

1st month payment 512
Security Deposit 550
Acquisition Fee 625
Fees and Ins 22
Taxes 52


Total Due at signing 1800

Is this a good deal? What can I avoid paying? I've never leased from BMW before. Thanks for any advice. He said I should put a deposit to lock in current rates in case they change when I'm ready to order (3months) but I wonder what happens if they get better.