What are the considerations for size and mobility when choosing a great tool chest?

We have grown up with the attitude that “bigger is better”, but that is not always the case.  If you only have a couple of screwdrivers and a hammer you don’t need a 72″ gigantic chest with loads of tool chest drawers now do you?  That’s a lot of wasted space, and you will be wasting time opening and closing drawers trying to finding out where everything is.  Now you could spent your money filling this chest up with other tools, but if you don’t use them, why bother.