I second the Sumners. I have a brand that is orange in color, can't remember, seems like they are Rigid for some reason. Anyhow, they suck. Each time you go to raise them you literally have to hit the washer with a hammer(or hammer like tool) to slide the head up.
I have abuse my Sumner jacks, used them for all manner of things and even used them as a truck jack as they were a perfect fit under the truck at the frame. At the LWS I paid around $70-75 each for them years ago.