I noticed that many raiding beasties prefer TBM-raid DPS belts over EOK-raid belts, the reason being their procs.
Namely those two belts.

Emblazoned Belt of Boromas
http://everquest.allakhazam.com/db/item.html?item=125286

Cured Flesh Sash of Boromas
http://everquest.allakhazam.com/db/item.html?item=125288

Emblazoned Belt of Boromas has "Boon of the Seeress" focus effect on it which procs whenever wearer casts DDs.
Cured Flesh Sash of Boromas has "Overdrive Punch" focus effect on it which procs with melee skills. By definition, I am not sure if it works every time wearer swings his/her weapon or uses an AA ability / disc or both.

I see raiding beastlords generally go for Emblazoned Belt of Boromas.
Which one do you think better according to your experiences guys ?

Latang I was also looking for a source that shows up Beastlord AA abilities. Thank you for sharing the link.
About the AA preferences, It possibly depends your playing style.
I find myself moloing (me+warder+healer merc) most of the time either for farming exp, camping some item or doing progression.
Therefore I started with my warder defensive abilities because at this point my warder makes a better tank than me. Our team obviously needed a decent tank and our warder can obviously fill that slot.
After that, I have been going on with my own DPS AAs. When I complete those next I plan to get warder DPS AAs. Then I will get other bits (such as resistance and stats increase etc) Last will be the TS AAs.
But another Beastlord, who usually plays in groups might find it useful starting with own DPS AAs going on with warder DPS AAs since possibly warder will not be tanking much.
Right now I have 19 k + AAs and got all my warder defensive Alternate Abilities. The only thing I am missing for making my warder stronger is the EM24 earring which I will be claiming soon. As the things stand right now, my warder tank very effectively even holding multiple yellow con mobs at EOK, with my healer merc healing.

Hmm. I'm embarrassed to say I didn't even think of pet defensive aa's, even though they should have been obvious. Is there an up to date list of AA's somewhere with explanations of what they actually do? I couldn't find them on Daybreak, though it's possible I just didn't look in the right place.

Buy all the AA's!

Yep. Going to. But I'm getting about 50 a night, if I'm lucky. I am at 12k AA's, and it seems I need about 20k or so to be effectively done with AA's.

Are there any AA's that I will regret like hell not getting? At this point I've maxed Para / F para, and working on CS/CA so I'm not such a paper tank.

Mark the bard as puller and the Tank merc will not attack until the mob is in camp/proximity of other toons in the group.  Something to put on your ToDo list: A)  head to scortch wood and get the Ancient Skelly camp.  The Plaguebringer drops an aug you want as well as a belt that has a raid level effect on it.  The effect adds 500 dmg to every proc (not debuff procs) after crit.  This is an easy way to bump dmg on any melee toon, but especially Bards and BSTS and Rangers with their proc on every swing disc/AA ability.  The procs on EoK weapons are insane compared to previous procs (except for lifetap procs, they SUX big time).  The aggro is insane as well, but Bards and BSTs benefit greatly from procs.

You need to get your bard a good shield and a Horned Wurm Slayer from Frontier Mountains Ancients quest.  The Wurmslayer has a permanent effect on it that reduces every hit on the wielder by 1500 points of damage.  It really helps with surviving the pull.  In seb I pull with the bard and then have him hit his aggo disc/aa and tank while I get the pet on the mob.  With a wurmslayer and shield he survives pretty good.

-Z-