I bought a 48" TV for my bedroom. It was much to large for the ~2m distance you are talking about. The 40" I replaced it with (don't ask...) works much better. There is a lot more to TVs than res and size. Newer is generally better as well. But the tech in the TV matters just as much. If a 55" TV was the same price as the 43", I'd assume the 55" is an older model and probably not worth getting.