Could some one take a shot at this and list the required add-ons for Raiding?
Also since DYS has a couple of add-on reviews I'll add the links here.
Skada
Vuhdo
Rogue DPS add-on
HealBot
I have a bunch of add-ons I like to use for different things, so here's a start on my list since I'm at work writing this.

DBM Deadly Boss Mod
Skada
Auctioneer
LilSparky's workshop
Ackis Recipe List
Tom Tom With Gavins Horde Guide.
Titan Panel (Basic Panel)
Spartan
Squeenix
Bagnon
Prat
Decursive
Bartender4
Vuhdo
Digits

Will add more later maybe with a image.

Its interesting in regards to addons. I have actually found that less is more for me.

What I mean is I have really cut down the amount of addons I use. I prefer to have my screen open and not bog down performance with alot of addons.

I use:

Healbot
DBM
Decursive
Questhelper
Bartender
ORA2
Recount

Thats it......and I could probably do without recount but I feel the rest are a must