10 man raid comp help

Hello everyone, i was wondering about composition of 10 man through every patch of wotlk, maybe someone can give some insight.

My doubt mostly consist on healers, i've searched and it seems that resto shamans + disc is good, but runs oom fast, since shamans are mostly welcome as resto (bcs the dps specs are outclased by some other classes, if im not wrong) then the other healer is what im trying to figure, tanks would be mostly blood + ppala, dps would be something like 3 melee and 3 ranged, or 2 melee 4 ranged, yet it would depend of the healer im missing.

Anyway ty for reading :)