I'm a side sleeper, I use this. It doesn't feel well when I lay on my back though. Too much support.
http://www.amazon.com/Serta-Memory-Foam-Sleeper-Pillow/dp/B010AIOH9G
It's alright. Nothing has ever radically made a difference. I've also used a buckwheat hull pillow. It supported my neck well and easy to adjust to the correct support level. Sometimes I would wake up feeling like I was sleeping on a sandbag though.