I took a refresher course with Nick and Kyle and thought they did a really good job, its kayak specific and a lot of hands on rescue work which is what I wanted:
Kayak Instruction, Swiftwater Rescue, Colorado - Downstream Edge
I also know that Mike Mathers comes very highly recommended:
Mather Rescue - Index
I think either of those you would not be disappointed. It seems most of the classes pop up right at the beginning of the season (April'sh), lots of raft companies set them up, and their is a lot of private classes as well. I know I have seen a bunch of other people post that they offer classes I think RA Guides does as well.