I also use Aquarium Pharmaceuticals, and like them just fine. Beware however that you can get some outdated ones, like I did with my nitrate test kit. Next time, I'll check for an expiration date on the package! Also a good tip would be to have your lfs test the water periodically and compare to your results.
As far as pH, IMO, that's not nearly as important as ammonia, nitrite, and nitrate. My pH is very stable however, due to the hardness and high alkalinity of my water. But it's a good idea to test it now and then.