I know the game is meant to be 'bring the player not the class' these days but I wouldn't mind some other opinions.
Back near the end of WoTLK me and the other officers agreed we'd run 10mans in cata, and I'd run one of the groups.
About two weeks into the expansion my computer had a SMART error and got sent off to be repaired, took nearly 3 weeks of me chasing them up before I got it back. So I finished leveling my shaman, specced resto and started gearing with guildies.
By this time the group I was setting up was going to be our 3rd progression group, so I was kinda scraping the bottom of the barrel for tanks and healers. Not saying I'm a great healer, I was just the go to offspec healer in WoTLK. It didn't take long for me to get dps apply, but a lot of tanks from WoTLK were now dps. Anyways, I finally got a group together and we'll be hitting our first raids next week. All the members are skilled but we don't have a hugely diverse groupn here is how it looks:
Tanks:
Two dks
Dps:
Two spriests, fury warrior, hunter, unholy dk
Healers:
Two shammies and a pally
As I say, not a hugely diverse set of classes but after two groups being set up that's just how it is
I can link armories later, posting from my phone atm.