Best internet service providers in Karachi

assalam-o-alaikum to all,

i am resident of Karachi new Jail Chowrangi, Jamshed Road No.3.
I want to know which one is best service and affordable I can avail ? currently in our area i am using service with 600 rupees for 1 Mb link (but you all know about this type of service providers).
please suggest a better service provider in the area mentioned above or something else ( Zong and Warid signals problem although because of Jail nearly all services have problem as per public mentioned )