I just put in the same lift about two weeks ago! I bought mine from Northern Tools for 2999.99 shipped. I shopped around for quite a while before buying and it was by far the best price I found.
http://www.northerntool.com/webapp/...talogId=4006970&PHOTOS=on&productId=200102624
I still haven't gotten comfortable with seeing the NSX way up to the ceiling with only one leg holding it! I installed the lift myself with a couple buddies and I will tell you that it isn't a job for the faint of heart. If I didn't have a front end loader on my tractor it would of been almost impossible.
There are some downsides to this type of lift though, for one if you are parking under it all of the time, the post can be in the way for the passenger or driver side door. I also have a four post lift and this isn't a problem. Also there are bars that come out from the center post that you have to drive over when parking. My NSX is lowered with Teins and I don't believe that it would clear the ramp that they put over these braces.
Some of the benefits of the lift are a much cleaner look, very well made, and a separate unit to house all of the hydralics. This lift also has the ability to raise the car higher than my four post lift so I can walk under it quite easily. They also have another version that raises the car even higher for people with really tall garages.
My unit has solid galvinized panels, so that there is no possiblility of anything leaking on the car below. I use my other lift if I want to do any work on the underside of my cars. They gave me the choice of either version when I purchased the lift.
As far as garage doors and openers, you can raise your rails of the garage door tight to the ceiling and either add a panel to your existing door or put on a side garage door opener. I went with the commercial openers that mount on the side, these provide a much cleaner look than normal garage doors openers.