[...] The Webcam Booth (Cheese) takes pics and videos well, but there is no audio in the videos.
I gave up using this. Is very old and does nothing "top-notch".
Here is what I use:SimpleScreenRecorderDesktop screencast. Probably the best available in the Linux world.
VokoscreenWay better than Cheese, but very different from SimpleScreenRecorder.
For screenshots, I use the internal "PrintScreen" assigned App. I forgot the name, I guess it's something like "xfce4-screenshot" or the like. If you want something more professional for screenshots, you can try searching with Google, but I am please with the XFCE's tool. Flexible enough for what I need.
You can also use at some extent VLC's screenshot capabilities.