Ok so this is for you Shroom, or anyone else interested.... Hahaha having bad internet and a will to catch up to awesome people, Ive learned a lot of info on mods and raids and such!
Altoholic - Mod to see cross char bags, inventory, gold, equipment, etc. Also does cross guild and other useful information.
Atlas Loot - Mod to see what drops in what dung, raid and to view gear.
Bartender4 - Mod to add more action bars, works hand in hand with my UI
ClassTimer - Used for any spells or skill that you need a quick timer on.... such as DoTs, HoTs or anything else alike.
Deadly Boss Mods - Allows for raid warning during raid or dung boss fights *must have*
Gear Score - Quick and easy way to see your char/targets gear score.
KillStreak - I used to be a huge halo fan so my mod to tell me when I get "Head Shots" and "Triple Kills" LOLZ
MFClip - Great mod for Shadow Priest, allowing for a decrease in casting time delays and allows for rotation without clipping
MiksScrollingBattleText - Mod for a compressed, close to char list of text that shows incomming spells,dmg and heals, as well as outgoing dmg and a great notifier.
Omen3 - Awesome Threat Meter.... Who knew Shadow pulled so much aggro..... sigh
OPie - Alternative to Lunarsphere, both allowing a quick and easy access of spells, potions, foods around your char.
Outfitter - Like WoW's in game equipment manager, but allows for a quick and simpler way to map out different equipment sets.
Postal - Mailbox features.
Power Auras Classic - Can do anything from give a heads up aura to what spell was cast, to if your entering combat, to being me and when ever I shadow weave I get wings LOLZ
Prat 3.0 - Awesome mod for chat, that allows for easy chatting wether it be in guild, whis or say.
PvP Trinket Tracker - While in BG's or Arena, shows what trinkets have been used and the cool down on all trinkets.
QuestHelper - As lanky said, ingame WoW one is just missing something.
Spartan UI - Nice graphic UI that sets up your bartender for a nice, quick access to all spells and abilities.
Talented - Like WoWHeads Talent generator, it wont let you choose to place a point into a talent without an ok!
XLoot - Upgraded loot table, basically same WoW principal, but made pretty....
Well Shroom, thats everying I use..... Also i would try maybe quartz or another spell bar for your mage. Hope it helps
thank to lanky, red, kitty and curse!