Best place to exchange $ for Pak Rs in Karachi

I have been given $500 as a gift from an uncle for clearing an examination. But i dont know which is the best place to go to convert this in Pakistani Rs in Karachi. Would like some suggestions.

There are many at I.I Chundrigah road and Shahra-e-Faisal.

or you can try Pakistan Currency

Or you can go to Aghas in Clifton.....there are many many places....with all about the same exchange rate.

And i think if there is Foriegn Exchange Department in Ur Bank..........Then it can also provide its SERVICES to u....!