Link doesn't work so I cant tell what you are tempted by, however Sceptre is 100% trash. AOC I have no experience with but I wouldn't pick them over a real brand. The 850 dollar Vizio is a good bargain and the 800 dollar Sharp is a mad bargain at the moment.
For 800 that Sharp is a steal, for 1000 that Toshiba should offer a good improvement.
*edit* Wow there's a 46" Sharp at Costco for 1K. If you can fit it, that is quite the buy.