Well bro i don't know about market conditions in karachi but in lahore everything is fake Chinese crap, the ballasts of Chinese makers start losing power after a couple of months and stuff. I recommend that you go for 4300k German or Japanese HID which is very hard to find i must say.
And don't get any hid more than 6000k, though i would personally prefer 4300k or 5000k anything above these looks too damn blue and doesn't illuminate as much