I currently have the LG 43" 630V. I'm not entirely happy with the picture quality nor the brightness. I've got an opportunity to return it due to a defect and was looking at potential options. I've found the Samsung 6400 at a similar price. However, it's 40". I am willing to compromise on the size if the picture quality is much better than the LG. Any advice please? Should I get the Samsung or stick with the LG?