The addons i use for all chars :->
Ofc ktm and decursive
and from ctmod i have mailmod ctraid and bossmod.. deleted the rest.
Bongos (quickbars easy to setup using /bongos)
X-perl unitframes ( this is the best tip i got, it makes healing / assisting soo much easier.. try it
plus it has some nice casting bars for enemies)
Atlas + Atlasloot (so you can see what bosses etc drop)
swstats (advanced kinda dmg meterish)
Fubar with charmsfu (and ktm and others)
(like titan bar but better imo and charms makes assigning target icons way easier)
Character specific addons :->
You can add alot more options to fubar fx on my rogue i have a roguetimer so i know when to resap etc
And for shaman i use totemus to keep track of my totems and when to recast em aso.
And also i got the www.auctioneeraddon.com package
All of the above can be found at either -
http://wowui.incgamers.com/
or
http://wow.curse.com/downloads/addons/
Just ask me ingame if you got any problems with the addons
If your tired of always having to ask or check websites for quests try lightheaded, it has comments and a arrow leading to your quest objectives epiiix
Oh and if you want to see a screenshot of my UI so far -
http://www.sendmefile.com/00566770 Im still working on it tho