I got the Bend Pak from ASEdeals.com , the 4 post 9000 lb extra large one , Its very well built and no problems with it and Ive had it about 2 years . I store my Cuda on it with another car under it , I also got a bridge jack which is killer when working on suspension parts , etc .
The only time I wish I had a 2 post lift is when I get ready to put the engine , tranny and K member in together from underneath
If you need storage space to double stack the cars , I think you would like the 4 post better
I have 12' ceilings and that works good , 14' would be better