Bro Dubai Islamic Bank is good option, they offer as low as 15% down payment plus 12.5% interest rate, in islamic leasing you pay the installment once car is delivered to you, in case of Wagon R they told me to process my case and hand over the car to me in a week as there are a lot of cars available in show rooms due to low sales.
In the end as others told you going for leased car is a risk ......start ma new car k shoq ma bnda ye dhol galay ma daal leta ha lakin after 6 months jb shoq pora ho jata ha aur car sirf aik car reh jati ha tu installments aik bht bara burden ban jata ha.
I had 7 lac budget, i was going for Wagon R on lease, every body advised me otherwise so i borrowed some money from my brother and buying a 2012 cultus in 8.5 lac......and i am satisfied.