I have two 4 post lifts from Complete Hydraulics.  Cheap and Chinese but great.  Less than 2K each.  Not difficult to assemble.  My wife and I assembled both; one using an engine hoist and for the second, we used the hoist on the tractor.  One is 220 and the other is 110 volts.  Strongly recommend 220 if you have the wiring for it.  It goes up twice as fast.  You see all kinds of horror stories on the internet about the less than great ones made in China but mine have never failed.  I always make sure the locks are in place and never stand under it when all for locks are not locked.    If I did major and daily work on my rides, I am certain I would have spent more but for me, these are wonderful.  One thing to consider about the two post for storage: over time, the frame will flex down and open up the gap at the top of the doors because the engine is heavy.  I had one and mine flexed as indicated.  Good luck.

Thanks Ken, I'm sold on the 4 post. The company where Dennis purchased his is less than 4 hours away and in route to family I visit a few times a year. Thanks for advice on lifting tecniques. My wife is 480 pounds and should have no problem putting it up by herself.