Best place to buy for retirement in pakistan (especially if you are on a tight budget but do not wish to compromise on quality) is a farmhouse in the state-of-the-art multi professionals cooperative housing society (www.Mpchs.Com).
It is at 20 minutes drive from islamabad and you can get (22,500 sq ft) or (45,000 sq ft) of land in a farmhouse community with 24 hrs security, pavements, streetlights, commercial centres, mosques, schools etc. Possession will be handed over early next year. Another major city even nearer about 10 km from it is wah cantt.
Check out the discussion on this scheme in the most discussed posts titled "islamabad orchards"