Here is my UI. It has gotten uglier since 2.4 but personally I don't care.
http://xs225.xs.to/xs225/08135/wowsc..._162414131.jpg
Important mods are:
-Pitbull, obviously
-Aloft for the bars over the enemy's heads
-Bartender3
-CyCircled skin comes from Caith's UI.
-Prat
-Chinchilla for the minimap
-Mik's Scrolling Battle Text. It's awesome.
-SLCore + Mods, which I have scattered about.
-Buffalo
The Other mods I use are:
-Omen
-Closetgnome
-Atlas and AtlasLoot
-Recount
-Bagnon
-Quartz. The player casting bar is under the player unitframe, and the target casting bar appears on top of their mana bar.
-Lightheaded for Wowhead info.