OK, here is a thought. You could go with a four post lift, and even though your head room won't allow full use of elevation, it would still allow the same amount of access as the scissor lift. And at some point in time, you may relocate or build a shop to house the larger lift. I bought a 4 poster some time back and went in with some other guys and we got a good deal. I sure do like the one I have.
like I said, it is another way of looking at it.