Pain Management Nursing - Income?

The time is coming in my short, abbreviated BSN program to pick what I want to do for capstone. Since capstone tends to be a internship - meaning if you like the place and they like you, you get offered a job - I need to make a good decision. After mucho rambling about different paths, I decided to look into Pain Management Nursing.

My immediate goal would be to find a facility where I can learn the nursing aspect of pain management and hopefully have the opportunity to integrate my acupuncture training. In the long-term, I would like to get my FNP and focus on pain management, which would basically allow me to assess, diagnose, refer, and treat with acupuncture + point injections + whatever else in the FNP scope.

But I am facing a large amount of debt from my master's degree in acupuncture program, so I need to make sure that working as a RN in pain management would pay enough in relation to my other options - ER, PACU, or ICU. The average income in KC for these three areas is in the high 50's, so I'm wondering if I would be able to make something comparable as a pain management RN.

Anybody want to disclose an estimate of what they make or how it compares to the other three areas I'm looking at?