Alright, I made a list of what addons you must have as a warrior. Every spec can benefit from some of these addons, and in every environment, like a tank, DPS or PVP.
You must always have:
--nc SpellAlerter: indicates spells which are flying around (enemies only) so you can adjust accordingly, like a spell reflection etc.;
--Power Auras Classic: very useful addon to show buff/debuff gains, I use it for different classes aswell, like when pala bubbles etc.;
--StatusBar2(3.2 but still works) or IceHud: modify this only to see the rage bar; I use this to see when i can dump more rage, it's very useful;
--Gladius: arena unit frames with warnings, no other description needed i guess
;--MSBT: I don't feel like using this, it annoys me, but it has a trigger area where you can put the spell name in it, add sound files etc.;
--Bartender4/Dominos: both are very good action bar mods, I don't use any cause my PC doesn't stand these
(, they are very good to group abilities so you dont have to look in 4 different directions;--Xperl/Pitbull: I recommend Xperl over PitBull because it is easier to config, and it's much more stylish.
BTW does anyone know why my WoW lags terribad with bartender/dominos? It freaks me out!!
SCT on the other hand is good, but right now, im just like Gforce, old blizz combat text with the arc animation 
