I'd recommend Skinner for the simple frames (can you child the frames in Skinner?) and various other uses it has. I used to use it because it removed so much art, gave a viewport, bottom panel, multiple other panels if needed, and was fairly easy to use for my knowledge level.
If you know anything about coding, you might want to try oUF for unit frames, there are a few layouts to choose from, you'd just have to code your own locations if you wanted to move them.
Everything is just preference, maybe look at something on
http://www.vranx.com/index.htm . It looks to be pretty thorough with updated mod information and a few "how tos" as well.