I keep about 1 1/2 dz 4" to 8" clamps on a rail under my workbench where they are quick to get at. Jorgensen clamps are the best quality for the price in my opinion. If you are going to use them a lot and maybe abuse them a little I would go with them. Most of my small clamps are light duty but I have 1/2 a dozen or so 12" of the Jorgensen's and they will last a long time and will take abuse.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.