Unless you are willing to spend $600+ they are all made in China now. I think the Harbor Freight aluminum 3 ton is the best price/quality combo:
www.harborfreight.com/aluminum-racing-fl...mp-3-tons-68052.html
The 1.5 ton jacks Harbor Freight jacks are flimsy and small. I would highly recommend NOT getting those. The 2 ton is OK but only marginally cheaper than the heavier duty 3 ton so I'd go with that one.
You can find the 3 ton occasionally on sale for $129 and they always have 20% off coupons in every car magazine.
If you don't mind hauling around a 150LB steel jack, their low profile steel jacks are cheaper. Costco sells a big steel jack that gets good reviews as well.