I only have information on Lahore. And here it is.
With Co-op Housing societies, buying and selling is relatively painless. Defence Lahore is a Co-op Society (now it has become Housing Authority a la Karachi) but the advantage is that it falls under cantonment rules and so no chakkar of court-kachehri. The prices are rather steep but then they remain steep. Its one of the most desirable locations in Lahore.
There are several other reputed Co-Op housing societies in Lahore. Some are very good, like Valencia (near Wapda Town) and Izmir, near Canal...both are developed by Pakistan Expatriates Co-operative Hosuing Society so most of their members are expats and the management is highly professional folks too. Some older co-ops are Tech society and Canalview, both on Canal, right after New Campus.
As always the advantage of Co-op society is that for purchase all you need to do is make payment and get the ownership transferred in your name in the society's office. Also, for all the above five, security of the plot is no problem and you don't have the worry about hiring a chowkidaar etc.
For buying plots in expensive and congested areas like Gulberg, Jail road, New Muslim Town, or Garden Town etc, the risk of forced occupancy (qabza) are great and also the ownership has to be transferred in zila kutchehree. This can be a hassle for expats.
Prices: Till about Jan 2001.. the price of a 1 kanal (4,500 sq ft) plot in Defence was between Rs 500,000 to 1,500,000 and more. Corner plots and those on the main road are even more expensive. Those in older blocks are generally more expensive than the newer ones, although those blocks which are in the flight route of Lahore airport have lower prices. Defence offers the best civic amenities amongst any housing colony in Lahore.
In Valencia, a 1 kanal plot is between Rs 300,000 to Rs 600,000. Izmir is slightly more expensive. Tech and Canalview are even more expensive.
Some plots in Gulberg and Jail road, go as high as Rs 200,000 per marla (there are 20 marlas to a kanal).
If you need further help in buying in either Defence Lahore or Valencia/Izmir, let me know and I will put you in touch with some folks who can help.