"Best tires available" is a thoroughly loaded question, Brother!
You'll find people who swear by Super Swamper TSLs. Others are strictly BFGoodrich MT/AT fans. Yet others will swear by Yokohama Geolanders, or Dunlop GrandTreks, or Bridgestone Duellers, or Saveros, or Maxxis, or Nittos, or Toyos.
Inevitably, a debate will also be triggered regarding the most desirable tire width, tread pattern, aspect ratio, specialised usage, and the like.
To be honest, thus, I would advise you to study the requirement you have (mostly road travel, I gather from your post), look hard at the budget available to you, and most importantly be aware of the capabilities and shortfalls of your vehicle. If you're keeping it stock, putting oversized tires onto it, is questionable. If you're planning on using it for road use, a mud terrain / bogger will be absolutely pointless. If most of your driving (after Chitral-Shandur-Gilgit) is going to be in muddy, clay-type terrain, getting a pair of Desert Duellers, is likely to serve you nothing.
Tires and wheels are influenced by YOU and your SPECIFIC needs. Not really by what anyone else may say, or advise. Contrary to popular belief...YOU really WILL be the best judge of that, yourself. NOT an armchair "expert".
As a guideline, though, the tires mentioned above, are all good-to-decent ones, which should serve your purpose admirably. I hope that answer serves as a basis for your further research into the subject.
P.S. For locations, Saddar Bazar in Pindi is a good area. As are the Nila Gumbud and Faisal Town areas, of Lahore. Off-roaders in Karachi and Peshawar would be able to advise you on the tire-selling hotspots in their respective cities.