Buy any plot in Bahria before balloting of plot numbers, 4,5 months w8, then your investment will not be doubled but you will get a decent amount in small investment, the more the good locality , the more will be on top, usually a 50%-60% increase. I personally did this in Bahria Lahore and Bahria Karachi, just sharing my experience,
but right now, wait and watch any other good thing to invest