[Kraftwerk]

Mildly considering a used four-post lift. Should I avoid the chain-drive and a single hydraulic cylinder models? Probably going to have the hydraulic cylinders re-built for safety-sake. The ceilings are high and i would like the option to stack and store two cars in a one car space. Space is at a premium here in NYC and stacking cars is an obvious solution. Also, plan on doing an occasional oil-change etc. using the lift. Wondering if any one here can make suggestions as to which USED brand is better what to avoid.. power requirements (I have a 110 line and some electrical know-how.)etc.
Thanks Guys.