Wow-
with all those different classes, your UI must be a nightmare ^^ I must admit i do love trying to work out the best combination of classes for the 'perfect' group. Anyhoo.. i just started a about a week ago and i didnt want to over complicate thhings so i started with:

1 X pally tank / 3 x aff locks / 1 x holy priest.

The pally tank takes less micro-mgt than a warrior would, and is also shield friendly. The locks give me a lot more CC options than just a mage would. The priest is without a doubt the best 5 man group healer imo, he is also the one that requires the least micro-mgt and has the ability to pre-heal with shields etc. The 3x soulstone is very nice. If the sh*t hits the fan and my pally dies, i can rez him, heal, re-buff and re-soulstone him without ever having to switch to another char. I know im a little short on buffs (a mage + druid would help) but as this is my first team, i have designed around being easy to manage and not too complex so i can ease into it. The only real downside is that both the pally and the locks have quite a lot of quest related skills for pets and mounts ect but i can live with it.