Make sure you leave 6-8' from the front wall to the front of what ever car you will be lifting on average. The floor foot print needs to be at least 12'x24' and a min. 12' ceiling height. Also as stated a 4" concrete thickness is preferred.
The photo above is the top of the line lift in my opinion. Rotary Assym. with the duel control inbay controls, that's one finger touch up and down with electric lock release. the controls are on both columns, so you can lift or lower from either side of the car/lift. Also note the position of the power unit, up and away from the operator and a cleaner overall look for the shop/garage and added walk around space around the lift.
Lot's of lifts on the market to choose from, keep in mind you get what you pay for with quality, warranty and overall life of the lift.
BTW Chad, nice looking straight racer you have there. Looks good on the black Rotary.