Motion graphic software suggestions

I'm attempting to find motion graphics software to visually explain complex topics.

Here's an example of what I'm after: http://ift.tt/1uHlxdS

I've looked at Houdini, After Effects, Boris, etc., but all of those products seem to be overkill for what I'm trying to do.

I'm just looking for a few standard shapes/images (and ability to import my own images) that I can move around and voice over.