Hi all just about to get a heavy bag from ebay. Just a couple quick questions. 1 height what sort of height should i be looking at (im just over 6 foot) would a 4ft bag be ok? I havnt put the bracket up yet but its going to be on the outside wall of my house so i can hang it quite high. IM probably not a hard hitter and i weigh about 170 pounds so what weight should i be looking for? I was concerned that a 4ft bag would move too too much ??But on the other hand its got to be (this sounds strange) relativly light that i can put it up and down as i dont want it left outside. Any advice appreciated!