I have a lift by Backyard Buddy. Dumb name, but they make a very sturdy lift. They cost a bit more than some others, but worth it in my opinion. Their website is:
http://www.backyardbuddy.com
Watch the video to get an idea of how they are made. For example, the posts are full four-sided and not open channel like some cheaper brands. They are also sturdy enough that bolting to the floor is not necessary. It comes in three different heights and prices start at around $3500. The basic model is rated at 7000 lbs. The lift weighs about 1800 lbs. They are made in Ohio and freight to my house in VA was about $375, but that will vary depending on where you need it shipped to.
The treads are about 400 lbs each and although they say two people can put it together, you need two or more pretty strong guys to do it. They will also recommend an installer if you don't want to try to do it yourself. I had mine installed by one of their recommended installers for $500 and worth every penny.
One other caution, however, if you have it delivered to your house, the trucking company will not unload it. That's up to you. Another reason to use the installer. Mine picked the lift up at the freight depot and brought to me then assembled it - all included in his price.
