When talking Bossmods...
Quantuvis for Raid Leading and standart buffs XRS is great. I actually use that and RABuffs while RABuffs is the tool I check every little stupid buff with. Be it equipping of Ony Cloaks at Nef, or can also check if I am doing Azuregos and which living people have the mark on, so I make sure they aren't in any relevant groups. You can check for literally every buff in the book needed in raiding.
Back on the Addons... in regards to Boss Mods.
BigWigs rocks, but does not help if only 1 person in the raid has it. And when your guild is already required these Addons and that Voice Comm and forums and roster, yadda you do not want to force boss mods on them I think.
I personally use La Vendetta Boss Mods. It's just so much better on FPS than Enemy Cast Bar, shows the bars though. And it's a lot more complex in things it can announce to raid on Bosses. It can be a bit spammy though (if your MT decides to spam every little option out there your screen can drown in it). Well if you don't want the spam you can always install BigWigs to block it... but err yeah ;)
http://www.curse-gaming.com/en/wow/a...nd-aq20zg.html