One of the key things I like to look for in a new pillow is the ability change the height.
Having it height adjustable means you can alter the pillow based on your particular body and sleeping needs.
We sell the Chiro-Pil-O which I have used myself for years and swear by it. There are other height adjustable pillows out there and I would highly recommend at least looking into them when choosing a new pillow.
If you want to see the Chiro-Pilo-O and are local, feel free to pop into the clinic to have a look.