Well, it seems this is going to be a bit of a bloatpost since I made 2 styles (one for health, one for power) when I only needed one. Oh well. Ladies and gentlemen, to my knowledge, the first fully functional circular-progress mod. (I don't think I'll be using it personally, but it was a lot of fun to make it)
Talyns, I ended up using your version since it's just so much easier to manipulate than mine.
Edit: Oops, ignore the ammo window shown in the screenshot--that's Sunthas' ammo window overlaid on the player window. I forgot to Photoshop it out when I cropped the screenshot.