I always go with need before greed meaning the person will use it NOW or at least as soon as they get it enchanted or modified.
I would second look at who attends the most often meaning someone (as in a character being played) who's at every raid and every boss should get at least some consideration over someone who can't.
I not sure how well you can multibox some of the bosses and you apparently don't bring them every time so I think they would roll in the non-need section, and hopefully you aren't opposed to spreading the wealth around if you start winning too much for the night that you start passing on stuff.

it might be best to get the group to agree on whatever loot policy is before the raid starts, that way you can opt not to bring extras that aren't going to get anything for all of the extra work your doing.