Great information in this thread guys (y)
Just came across this site which let you compare all of the available 3G/4G packages and the best thing is it categorizes them according to city too. I find it quite useful to compare packages. Here's the link Find Best Broadband Internet Prices in Pakistan
Also, I want to ask that I am currently using Ufone and thinking to buy second SIM for good 3G services. which one should I prefer? Zong or Telenor?