Sir MashAllah very nice and well kept ride you have.
My brother had a September 2009 GLi in same color, stolen, never recovered, white color is a very risky buy in Corolla, in Karachi.
You can easily get 1200K Rs for your car in Karachi, more in your city.
After that you can buy a GLi 2010 for 1400K or a 2004 G Corolla 20-28K driven in good condition, also a 2009 City A/T for 1300K or lower.
If you can make your budget higher you can buy a 2006 Axio X for 1688K Rs. 12-18|K driven or Altis Cruisetronic SR 2008 for 1800K or a Civic Oriel PROSMATEC 2009 Petrol driven 13-19K for 1750K.