GRID will forever be my favorite style of raid frame.

Simple, to the point, customization for priority information.

Within a single box you can quickly tell (with some settings)

A) Health. The box fills according to health percent.
B) Incoming heal. (I set this in a corner)
C) Has a HoT on them (I set this in another corner)
D) Afflicted with a debuff. (In a corner for generic cases, BIG ICON on the box for important stuff)
E) Has agro (Red box in the corner)
F) Mp levels. (Frame around the box, color changes based on MP thresh holds)

It made keeping track of the status of 25 people real damn easy. Granted, you don't really need that in an 8 man, but I still miss the simplicity, especially as it took up so little real estate on the screen.