Look into Kadian as well. ER work better, then you can add an IR back in at smaller doses to help when your pain escalates. Plain MSIR works well IMO, and is cheap. There is generic morphine extended release, but it doesn't release the meds as consistently-it's about 1/3 the cost though. It's best with ER to take every 12 hours.

Regarding Opana, I tried it at one point, and I think it made me feel more intoxicated than than I'm comfortable with, similar to how I respond to Oxy...