During my hc raiding days every1 had to give in a bis list to the raid leader. If something wasnt on ur list u had low priority even it was an upgrade. When 1 piece was bis for more then 1 person (esp weapons, trinkets etc) the one got it to whom it was the biggest upgrade tokens where given out randomly. though if u won something already this weak u wouldnt be in the run. This worked well for us, in both 25 and 10 man settings.