A few months ago I purchased a new Sealy posturepedic mattress and two 'Sleep Options' cool gel pillows, one for back sleeper and one side. (I start out on my back and end up on my side) Best. Pillows. Ever. I don't ache, I don't need that small pillow between my knees, and I sleep so soundly. I'm sure the new mattress adds to it, but I highly recommend the pillows.
fwiw - I had previously purchased a Bobs mattress and box spring and will never do it again. After two years it had sagged and mornings I felt like I had been in a fight. When I told the salesman about it he said many people have said the same thing, so if you're in the market for a new mattress, buy a reputable one.