I haven't tried Createspace - only Smashwords, but I have no complaints, especially since I've only self-published the one book. I have a few others. I have no idea why I'm just sitting on them.
As much as I dread NaNo, I have been marking it on my calendar for a few years now. The support is great, especially if you're in a decent region. It never hurts to give WriMo a shot! :)