Sir Nissan Sunny is very good, but you cannot buy one for less than 750K Rs even in Karachi.
N16 was only available for sale locally from 2005 onwards.
There is no difference in Lancer and Sunny, both are imported, both have expensive parts and no resale.
2003 Vario or 2001 EXi PROSMATEC are aslo in the range, but in KHI only.
So your real competition is between an Indus GLi and City EXiS.
Indus Corolla has really cheap parts, but its merits ends there as it is no match for the D13 and neither it has the option of A/T.