Crystal ones are the one that you see on euro II Mehran or some older models. They have transparent plastic glass on front and very good projection. I think you may have them on your Mehran too.
Usually, two denso relays are installed for lights, 1) for low beams 2) for high beams. That should cost you around 700 rs.
Koito 90/100 watt halogen bulb pair costs around 550rs.
HIDs are expensive and are of no use, unless you have projection headlamps (latest civic, accord, and other expensive cars have them).