Which pillow should i buy?

http://www.amazon.com/MEDIFLOW-Water-Pillow-Mediflow-Padding/dp/B000EE5DTK/ref=sr_1_11?ie=UTF8&s=home-garden&qid=1267861718&sr=1-11 or http://www.amazon.com/3-Pound-Memory-Foam-Contour-Pillow/dp/B0009U5OVQ/ref=cm_cr_pr_product_top

Im 14 and i have cervical neck pain


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