I bought a set of the Cooper HTP's for my 01 Tacoma same tire size around this time last year. Used a DiscTireDirect at ebay $100 off $400 promo, plus there was a Cooper rebate and since I got it price matched at local Disc. Tire store also got a rebate for using DT Care One card. Anyway, tires are great so far and deal was super.
I have no experience with the Cooper AT3, but based on my HTP experience and current promotions, I'd recommend the Coopers. The HTPs are made in the US, Texarkana plant iirc.
Currently Discount Tire Direct has $70 off AT/3 Cooper rebate, a current $40 off web instant savings, and another $40 rebate if you use their DT Credit Card on a set of four.
I'd say go to a Discount Tire b&m store and get a price match, but upstate SC, depending where Gastonia store might be closest. But Discount Tire Direct still a good option, and shipping included in price.