Recommended Addons

PvE Addons:
Deadly Boss Mods:
http://wow.curse.com/downloads/wow-addons/details/deadly-boss-mods.aspx
-Helpful addon that allows you to see the health of all bosses at once, similar to four horseman.

Omen Threat Meter:
http://wow.curse.com/downloads/wow-addons/details/omen-threat-meter.aspx
-Calculates all threat being caused by yourself and other members of the raid group.

Recount:
http://wow.curse.com/downloads/wow-addons/details/recount.aspx
-Calculates all damage taken / dealt; as well as healing taken / done, ETC. in the raid.

xLoot:
http://wow.curse.com/downloads/wow-addons/details/xloot.aspx
-Changes the original raid loot menu into an easier to see raid loot menu.

Prat 3.0:
http://wow.curse.com/downloads/wow-addons/details/prat-3-0.aspx
-Enables you to change the chat format to view a lot of helpful information.

Healbot for healing/tanking.

You're probably thinking why for tanking. Well it has this nifty feature that tells you when someone has aggro on adds so you can get it off them fast like. I used it on my other server when I was a warrior tank. I felt blind without it.

as i remember u can see on xperl to, that who has aggro.

Gathermate for gathering professions.

Bagnon is a must! Customize the looks of your bag & bank so they take minimal space, & have the ability to look at what's in your bank anywhere!

Classtimer is a cool addon that saves you from having to look up at your buffs to see how long until a certain buff wears off from you or a debuff from your target.

using all of them except xLoot