This is the UI that I use for my DK Tank (also use for his DPS spec) and am using this for the Warlock that I am currently leveling. I will more then likely be using the same addons when I get around to leveling a healer (I will probably just move them around alot). I set up this page for if people want to discuss my UI or need help with it at all.

Download the UI

Pictures of the UI in action
Out of Combat
In Combat
Instance
Raid

Goto the bottom of the WoWinterface page for information on how to download and install the UI

List of addons
Ackis Recipe List
Atlasloot Enchanced
AzCastBar
Bartender4
Cartographer
Cooldowns
Deadly Boss Mobs
FuBar
IceHUD
Omen Threat Meter
Parrot
pError
Pitbull Unit Frames 4.0
Postal
Prat 3.0
RatingBuster
Recount
SatrinaBuffFrame
SexyMap
Skinner
Tidy Plates
TipTac

FuBar Addons
BagFu
CalenderFu
ClockFu
DurabilityFu
FuXPFu
MailFu
MicroMenu
MoneyFu
PerformanceFu
WinterGraspTimerFu