I was just there with the same decision. I chose a four post. I don't have enough height to put a car on a two post and have the wheels hang down. If you have the hight, why not? Our race car sits on a two post most of the time without any issues to the car.
After hours of forum searching, I decided on Bendpak. Not one of the cheapest but reasonable. Seemed to be very good quality and built strong. I'm too scared of having My 68 fall on top of my wifes new 14 C/S Vert..