A long body pillow may seem like an extravagance, but they are just too delicious in the relief they provide. I never ended up buying one, though wish I wasn't so conscious of DP's eye on the bank balance, because I've borrowed one from a friend and it's the bees knees. I'll use it a bit more now that DD is here, but I have to give it back at some stage!!
For my SPD, before the long pillow (which seems to just be a long body pillow from Kmart, not a specialised one you can get from back specialists etc) I was using a memory foam thigh pillow (and was actually using it between pregnancies when the pelvis issues would flare up again - stopped using when I went back to yoga last year to complement osteo treatment) and the Dentons preggy belly wedge. Effective, until later in pregnancy when the thigh pillow was losing its usefulness.
I'd recommend some acupuncture for the hip pain itself, on top of managing the sleeping with a body pillow