If you plan to use the lift to store a car above another car, get the four posts lift. You should check to see if there are DIY shops that will rent you a bay with a lift. There are two shops in my area that rent bays with lift to DIYers and include the use of their tools and air. The price varies from 28 to 40 dollars a hours. The 28 dollar place is 40 miles from where I live whereas the 40 dollars place is only 2 miles away. If it is a job that will only take a couple of hours or less I will go to the 40 dollars place. If it take a day or more I will go to the 28 dollars place.

I thought about adding a lift to the garage but with places available to me, it would be cheaper in the long run to just do the work at one of those shops.

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD