I have decided that I have to break down and buy some kind of wet/dry shop type vacuum. Trouble is in figuring out how much of one I should get. I was at Lowes recently and they have a full line up of them from pretty dinky to pretty huge. The question is how much of a vac does one need most of the time? I don't want a huge one that takes up half a garage but I don't want a useless pee wee either. Anybody have any recommendations on how big should one go on one of these and how much should one spend? Opinions requested / brands / price / best place to buy etc.