Kathy Smith and Charlene Prickett are two of my favorites. If you have an aerobics step, I'd also recommend Gin Miller.
FYI if perky bothers you, I would stay away from Petra Kohlber (sp?) She is like Racheal Ray on speed!

Nice lady but wayyy beyond energentic!
I use the PUSH DVD for strength training and I really like it. The new DVD every month keeps me from getting bored.