Deadly Boss Mods or BigWigs:
http://wow.curse.com/downloads/details/4940/
http://www.curse.com/downloads/details/3299/
Omen Threat Meter:
http://wow.curse.com/downloads/details/9101/
Atlas Loot Enhanced (Optional, but recommended):
http://wow.curse.com/downloads/details/2983/
XPerl (Optional, but recommended. Very nicely shows buff/debuff timers):
http://wow.curse.com/downloads/details/3416/
Paladins
PallyPower:
http://wow.curse.com/downloads/details/3738/
Casters
http://wow.curse.com/downloads/details/3260/
Shamans
TotemTimer
http://wow.curse.com/downloads/details/5492/
More things will be added soon by myself or the leaders.
I recommend you get the addons that correspond to your class as soon as conveniently possible.
Thank you, guys, and see you when the realm is up and running smoothly!