Okay, so every time you go into a dgn/raid the order of players is always different. The tanks could be separated by 3 people or right under each other. My suggestion is to have the party list the same every time, no matter what dgn/raid, or level you are. So the party list I think so go (Standard configuration):

Tank
Tank
Healer
Healer
Dps
Dps
Dps
Dps
Pets (Summoner or Scholar pets) should be on here as well as they are vital to dps and
heals


Especially for those on the PS3, it would make scrolling through everyone to reach the tanks (who take the most damage) much easier.