Post a screenie of your UI and mention the mods you just couldnt live without.
Heres mine on my disco preist:
wow_ui11 - Servimg.com - Free image hosting service
General Mods:
Trinity bars (custom quick bars)
Gather (records the location of resource nodes and shares them with your guild)
Cool down timers (gives a pop up when cool downs comeplete for spells, trinkets etc)
PVP Mods:
SCT (scrolling combat text, shows damage and effects/abilities affecting you and your target)
Proximo (easier targetting and main assist in arena)
Quartze (shows enemy cast bar, gives a swing timer and customizes your own cast bar)
Raiding:
Deadly boss mods
This is far more upto date than the previous screenies I posted