I use a 2t floor jack most of the time. Probably came from china. Been around a long time. Might be a 3t - been even longer since I looked at the capacity. I can lift the entire front end of my D100 swb at the center of the front axle with it or the entire front of my W300. The D100 has the damn heavy cummins...
You could look on craigslist for a used jack. I've heard many people mention that most of the new ones are junk unless you spend more for a US made one. I bought an old Matco on CL. I was surprised when it said Made in Japan on it.
I happen to also be in the market for a new floor jack, mine crapped out. I found some nice blackhawk jacks at Northern tool for fairly resonable prices, but they are not aluminum. Blackhawk has been around for a long time. As far as 2ton jack that would be more than adequete for most home garages, unless you own a 1 ton diesel. I personally am going for a 3 ton jack because you never know when you are going to need the extra capacity, and it does not cost much more than a 2 ton model.
I've had a craftsman 3 ton floor jack for 5 or 6 years now, and use it to pick the entire front of my crew cab off the ground. I also use it on my '74 cummins ramcharger on 44" ground hawgs. That said, I've never had a single problem with it. I bought it new and store it inside though, so if you for some reason intend on abusing yours I don't know how it'd hold up. My buddy has the same jack which he uses with his cummins pickup, and we have the same jack at work in the shop. I routinely use it to pick up the entire back of trucks loaded with tools for brake work and tire swapping. Obviously, the wheels are chocked and jackstands are ALWAYS used in conjunction with the aforementioned jacks, but all have been reliable and provided good service.
Well, from what my buddies and I have experienced, we're happy... However I noticed yesterday when I was in Sears the price has gone through the roof. Mine set me back $60, and that's what it is, a $60 jack. No way would I ever reccomend anyone paying the astronomical $149.99 they're trying to get now...