@xulfiqar and Capsat, atleast i never said Alto is comfortable, Nor is it fun to drive.
But considering the OP's situation a very latest 2009-2010 Alto can be found in the price of Mehran + CNG + AC + Registration,
Alto maybe the worst of the cars but is atleast better then Mehran, And a okay okay car for city travel.
@Op, Do consider Chevrolet Joy, Its a pretty decent car too.