I really like Remileo's player window... though I decided to add to it a tad. I missed having my name displayed in that window (Don't ask why), so I played with a couple options there to also display current level/class.
I also made the percentages in a larger font for those running on 1280x1024(like myself). DUnno how it looks at a higher rez, but this pic is at 1280x1024.
Finally, I made the per-bubble mana bar (beneath the regular mana bar) dark red, instead of light blue... it stands out easier I feel, and makes it easier to get a quick visual on your mana regen.