There is nothing that says you can't run an air duct down through the wall and have it exit near the floor, if that is an option. Yes, pushing hot air down isn't as efficient, but it works.
When I did my remodeling, I wa primarily interested in improving the a/c performance, and I move my floor registers up the wall. I added in-floor heating, so the air ducts in the winter are a backup.
Radiant panels are nice...some can be combined with towel heaters. Some of these can be installed in the ceiling and are hard to detect. Radiant heat, as opposed to convective, is effective in almost any position (although in the floor is most pleasant). A radiant panel may not need as much in wattage as one designed to heat the air convectively in order for you to feel comfortable. It tends to be focused, though, and if you go out of the "beam" sof to speak, you can feel cold because it is not heating the air much. Depending on where you live, though (in the NE, electricity is particularly expensive) it may not be the most ecconomical. These can be put on timers, though, and that can help if your schedule is consistant. I put in a towel warmer in my bathroom remodel, but don't count on it for heat. Other designs and models can provide some significant heat, though. The one I had only has 165W, and is thermostatically controlled so it doesn't scorch the towel. Left to free radiate, it definately gets hotter and will run all of the time.