I was at my trusty local Porsche mechanic here in Walnut Creek last week and asked him who makes those nice floor jacks he has around the shop, Harbor Freights! Uses them for years with no problems. I looked at the cheaper models but I figured its always safer to buy more than you need.
I went out on his recommendation and picked one up, very nice!
http://www.harborfreight.com/2-ton-lightweight-aluminum-racing-jack-with-rapid-pump-68051.html