If it were me, I would get the wedge from the ramp wedge combo and see how that goes and see if there are any positions that we need a lot more elevation for. If that's the case I would get the Esse from the liberator site. You could just pass it off as modern furniture while the ramp would be difficult to store.
Which one will support the best during a variety of positions is there any multi purpose use of these? What is storage like?
I hear that the flip ramp is more stiff than the combo. The flip ramp would fold up into an ottoman (storage space issues) but the combo comes with two pillows if you need/want two. the prices tho-if you needed something cheaper, i would go with the singles before you go for a combo to see how well you like them.