James,
If you have a martial arts background I can make a few suggestions.
First off you might think about joining a MA video rental service like Goldstar. That way you can look over a variety of things in the kungfu world.
If you have a good background in JKD I would recommend Joseph Simonet's stuff (the slam set for the mook, and the 6 Seconds of controlled insanity).
Anything by Keating is good.. I especially recommend his Hellbows vid.
If you are interested in seeing a whole bunch of different stuff you could try out Ken Gullette's online school. He has lots of different video on there from the various internals.
If you want some progressive bagua videos that are not too difficult to understand you could get Dr. Painter's original Jiulong series.
You can PM me if you want specifics or have something in particular you are looking for.. chances are I've seen most of the internal CMA (non-taiji) and kali stuff around.
"The first stage is to get the Gang( hard, solid power). every movement should be done with full power and in hard way, also need to get the twisting and wrapping power, whole body's tendon and bones need to be stretched to get the Gang( hard) power. "
-Bi Tianzou -