If this is your first time sleeping on a wedge pillow, I'd highly recommend this. It's soft and adjustable, which makes it much easier to get used to. And it's the only one that can be turned around and used for reading. (Look down through all the photos to see the different suggestions.)

I'd recommend getting the special case. Not only does it help keep the pillow clean, but, if after a while you decide you want more height/firmness, you can add one of your old pillows into the case and, voila!, adjustability for free. :)

Just note that the seller also offers a wider one if you need it.