Sutts, I have almost every one of the isolation devices you name, and a few you did not mention.
I use McCormack (Mod Squad) Soft Shoes under the majority of electronic device I own. I do use several others, but find that every one of these devices are system dependant. The good news is that the Mod Squad feet are very inexpensive, and will always work somewhere in the system.
The last time I ordered some, I bought a hundred. They are almost all gone, as the other guys in my group try them and will not remove them. I suspect the Vibrapod is a very similar product, as it looks to be made of a similar material and of a similar shape. This is certainly a direction I would try before spending $300.00 to $500.00 on feet that may not be any better.
Maybe I could arrange for you to try some of the feet I own. As mentioned, I have the Carbon Blocks, Walker Valid Points (tall and short and both thickness dampers), Black Diamond Cones, Mod Squad Tiptoes, Sound Anchor Steel and Sound Anchor brass Cones, Purist Audio Pyramids, McCormack Soft Shoes , Simply Physics, Audioquest Sorbothane, Goldmund Cones and Symposium Rollerblocks with upgraded bearings. I may have some others, but would have to scrounge through the box and see what else is in there. I typically do not sell any, always hoping that one will be the magic foot under some component of the future.