Advise on buying a lot in Islamabad

Salam,

I need a sincere and honest advise about buying a plot measuring 40x80 or 1 kanal for future house building or sale for better returns.

I am mostly interested in CDA plots please advise on a good sector which is neat and clean, please don't recommend g-13 or 14.

I am planning to buy in December this year.

Regards.