I would say that most of them would work good. We have the Ramp and it is the perfect hight for the wife. The shapes like the Jaz and the Wedge looks like they would give the user a more laying down type position. Could be fun too.
Pillows are great ways to add longevity to a position and added support. Pillows of all shapes and sizes allows for you to try new positions and different angles for penetration. Everyone should have a few pillows in their bedroom.