Thank you all!!
We're going to begin with 3 healers and 1 tank+ 1 feral (or a hunt/rogue)
I'm the disc, i'm not excellent but not that bad (ranked wol a few times, in spine hm for example) but a disc+ a feral/bear (ranked in nearly all the hm boss in the top 50) will be ok i think to solve a 'dps problem'
I'll keep you advised but thank you for your excellent advices
First time i post on a forum and i have so much clever answers (and that i'm not threated like a noob!!^^)