I am using nexen SB702 (165/70-R12) in my khyber for the last two years. Driven about 40+ K kms on these in lahore, motorway and till Naran. No puncture yet. Bought them for Rs. 2850/tyre from metro (Lahore) in Nov 2009. They will be good for another 10K and after that i have replace them.
SB702 is polyester + steel tyre but is good in keeping shape and is also economical.
I also have hankook in the same size as above but as a spare , it is pretty much same as nexen like sidewall is polyester and thread is polyester (1) + Steel (2) and made in korea. they are also economical .
Prior to nexen i was using hankook pair in front. they were good but not better than nexen.