As per your decent budget I will suggest you a Honda 125 Deluxe with front disk-brake. In Black Colour
*Mileage: Very Nice as compared to others.
*Parts: Availabity not an issue through out Pakistan
Paiggo Storm a nice bike -- but did not catch the market cause of the parts avialabity and poor marketing. else its a nice bike with lovely ride.
Since you going for your 1st Ride -- take a Honda Start, God Forbids if Honda gets scratches or parts replacement it will be done easily else for others you might get tough time in repairing it.
Good Luck for the Bike purchase Plan --- All the Best.