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Griots Garage has a good rep for quality products. I have and know others who have been happy with their Omegas. The other jack noted is an unknown to me. I think Northern Tools also sells the Omegas.
Good luck.
WalMart sells a Black Jack that is a great jack. It is a 3 ton heavy duty commercial type floor jack (you turn the handle to lock/release it) with low clearance (3+ inches). You won't be carrying it around, but it rolls nicely. Arround $50.