Thanks for all the suggestions. I think I'm starting to get some ideas that will help. Bands seem to be particularly good for rotational stuff because it's hard to get a kick out of weights on rotations because you're not actually lifting them, just moving them side-to-side. The russian twists are good, and I've added them to the strength side of my core workout. I tried adding lawn mowers in rapid side-to-side succession to the cardio/compound movement part of my workout, and they seem to be a pretty good fit. Probably wood choppers with bands and twisting uppercuts with dumbbells will also fit into the cardio/compound movement part, but I haven't tried yet.
dswithers: Do you have some experience with Tai Chi or Chi Gung? Do you have any recommendations about approaching either of these? I'm trying to get as much benefit (weight loss, overall health and functional strength) as possible from a pretty limited time investment, mostly from compound cardio movements -- not trying to bulk up, be a combat warrior, or zen master (yet).
Steve-O-68: Same questions for Tae Bo... Any recommendations for approaching it?
If anyone has cross-spectrum experience in several of the more specialized disciplines (yoga, tai chi, chi gung, tae bo, pilates, ???) and can make some very pointed suggestions, I'd appreciate it. So far, my workout is mostly basic calisthenics, and I like it well enough. I'm very space-constrained and time-constrained, since I live in a small house, have twin babies to watch out for, and have to travel periodically, so exercises that don't need much equipment (beyond dumbbells and bands and such) and can be done anywhere (including office, airports and hotels) are best for me. I'm very much out of shape (45 y.o., 250 lbs), but starting to make significant progress (lost 30 pounds, feel much stronger).
Thanks to all for your suggestions.