I took a look at the 60" 6050 again at costco. With a completely white screen, there is very minor non-uniformity. The bottom corners are slightly darker than completely white, and the furthest half inch or so of the right and left edges may have been less than completely white. These issues are only evident if your only goal is to spot non uniformity issues, and even then the issues range from between minor to non-existent.
Overall uniformity is excellent however. This tv looks great and I hope to own one soon.
PS: if you want to save even more money, costco has a vizio 55" for just $700. The bezel is a bit large, and you're not going to wow anyone with the brand name, but the tv itself looked really good, esp. for the price.