Lorrapaw, for neck and shoulder support, they recommend firm support, particularly if pain is within the cervical area and radiating out to other regions. I use the curved pillows you get, it was recommended to me by my physio.
Lidl currently have some in store this week for £7.99 here is the link http://www.lidl.co.uk/en/our-offers-2491.htm?id=1074
I recommeded them to my mother too, as we both have cervical issues. [Only time I change pillows is when migraining, as I need to elevate and soften the pillow to reduse pressure pain] They take about 2-3 weeks to get used too, especially if your used to just normal shaped pillows. Its reduced my neck and shoulder pain and the number of trapezium strains and spasms I used to get, meaning less episodes of having to use a support collar and no more suffering weeks of pain. Additionally its aided in reducing the number of migraines attacks and cervical headaches I used to get too.
Highly recommend, I got mine from lidl, cant fault them.
Hope this is helpful.