My preference would be mehran with a k6a powered auto engine.
Few days back a guy near my workshop did this.
He bought a mehran for 1.5lac, spend 1.2lacs on it.
With paint job and denting and lights etc, wiring.
Then installed a k6a auto engine in it. He even installed a ac on it. The economy he's getting was around 16-18kmpl local.this idea was because you said you're a student, maintenance of this would be really cheap.
Incase of charade as hassan mentioned you should stick with it..
Then comes Khyber, you can buy a charade for around 2lacs, spend around 50k on paint job
Then another 60-80k on engine.
Swap in a m13a, m15a, g15 with a auto transmission and do the same.