I will get a vertical tilting wall mount for my 46" LCD. Do I need to look at certain specs? Is there really a difference between these that I need to look into? I know I need one that holds a 46" LCD but there are some that say they're recommended for 22"-46" size tv's or some that say 32"-55". Does it matter? Or should I just go with lowest cost among the vertical tilt 46" wall mounts?