Hi Chris,
Several years ago I too was running through all of the lift alternatives as I did not want to make a mistake. Ultimately I decided upon a 4-post lift and ordered it in conjunction with a rolling jack bridge. Having lived with this set-up for the past years and having done all kinds of work on GT's and a variety of other cars, I can tell you that I have absolutely no regrets and would HIGHLY recommend this set-up to anyone. Why?
First point that I would say is ingress/egress. It is just too easy to drive a car up onto the 4-post and off again. This is in contrast to a two post lift where there is a lot of hands and knees "work" to correctly position the arms to get them to the right lifting points and to hope that you got it right so that when you are finally up in the air, you can remove belly pans, etc. In terms of access, the Bend Pak 4-post lets you slide the adustable rail to anywhere you'd like. In other words, you can set it such that the inside edge of your tires are aligned with the inside edge of the rails thereby providing unlimited access to the underside of the car.
With a 4-post, they are equally suited for working on the car or storing the car in the up position. I would not advocate storing a car on the 2-post, first because of the stress on the suspension bushings at full droop, but also because of the stability.
4-post lifts are sometimes criticized for the inability to do wheel/suspension work. This is why you order it with the Jack Bridge. The jack bridges are rated at 6-7,000 lbs and they can effortlessly lift one end of the car or the other. They are air over hydraulic, so lifting is literally the push of a button. So, unlike a two post lift where you are on your hands and knees to position the arms correctly, for the GT's we drive them up on the 4-post and then raise the lift up 6'. Then we position the jack bridge effortlessly exactly where we want it, and press the button to lift whichever end of the car you want. Once lifted, we then lower the 4-post back down to the desired height. For wheel/suspension work, this would be approx. 3' off the ground. Simple, effortless, precise. The 2-post, wheel lifting solution you referenced is nice, as it simplifies the time to get on/off the lift (minimizing the hands and knees work) - but wheel/suspension work would require that you revery back to the conventional arm adapters.
Here's my recommended solution:
http://www.gesusa.com/BendPak-HD-14-Four-Post-Lift-p/119853.htm
http://www.gesusa.com/BendPak-RJ7-Sliding-Bridge-Jack-p/119435.htm
