Pillows are tricky. They have to fit your neck and also must able to be adjustable to the different ways you sleep. I like this video that talks about the different types of pillows. The store Relax The Back has a good selection of pillows for sale.
http://spine-health.us1.list-manage.com/track/click?u=f93264af165d7fb7124f7a963&id=1d06097555&e=0bb07e9cda
http://spine-health.us1.list-manage.com/track/click?u=f93264af165d7fb7124f7a963&id=1d06097555&e=0bb07e9cda