I'm afraid that "best" and "budget" are incompatible requirements, especially in this special case of using it from bed.
You might be able to find an expensive one that meets your functional requirement and a lot of cheap ones that don't. But both at the same time is doubtful.
I have some physical problem which limits my long sitting. Hence it has become quite difficult for me to work on a laptop. I am planning to buy a monitor (20 -21 inch) so that I can hook it up to my laptop through HDMI cable and use it while laying down on the bed. So I need a strong and sturdy monitor stand off course, I looked on the net but couldn't find any monitor stand that serves my purpose. Can anybody help me here, I would love to know any suggestions.