@ pk1 - excellent questiion, i was actually wondering the same thing. I personally having doubts on pechs, due to the price, and who knows, once top city and mumtaz city are fully developed, which would be better. Mumtaz city and top city-1 maybe better developed than pechs, its all good everyone saying pechs is brilliant at the moment, but mumtaz city construction co already have an excellent reputation so they may develop mumtaz city beyond our expectations thats why their prices dont seem to drop at all. As regards e-16/e17, it seems to be a new recognised sector, which has gone really popular now, its a tough decision actually as you mentioned you cant rely on agencys opinions on prices as things can change.
out of the above of pechs or cdechs, ii would prefer the g14/g15 - gulberg and jkchs due to the road links.