If you walk into a store and can't tell the difference in picture between a Vizio and a Sony Bravia or even Samsung, go with the Vizio and spend it on other things you have the ability to realize.
Personally, every Vizio I have seen has looked decent at best.
The bottom line is that you can price and research all you want. But, before you purchase, take a couple trips to different stores and see it in person. You have no idea how many tv's that are superior on paper actually look noticeably worse than the inferior one on paper. Also realize, contrast ratio definitions, and thus ratings, are defined by the manufacturer. So, one company's 10,000:1 is not the same as another's, often times with those numbers being inflated. Dynamic Contrast ratio is a farce so don't ever pay attention to it, and make sure the advertused CR is NOT their dynamic rating. That is often used to fool people as well.