I use many of the above Tom mentioned, adding to that:
3)
Damagemeters - stats on your groups damage, healing etc kinda fun utility but not 100% accurate
6) a few things that I use:
Autobar - little panel of buttons that auto populates with consumables such as pots, healthstone etc. No more dragging things from your inv to your UI
Scrolling Combat text - I highly recommend. Shows stuff from your combat log thats useful above your head, such as debuff, healing, damage, effects etc. Kinda looks poor but very quick at telling me whats happening.
Quick mount equip - simple mod that automatically swaps trinkets (for carrot on a stick) and boots (for spurs) when you mount/dismount.
Minigroup - changes default party frame to something much better in my opinion. Very customisable, also like because it's configurable to be more like the daoc group interface

I should imagine as a Shaman you might be interested in some of the weapon/armour swap mods also, though I don't use these being a priest I cant really comment.