If your looking to start a group and can get whatever classes you want to fill the other spots bard hands down followed by either a shaman, paladin, or both would be my vote.
What do I like to see most in a group? ME! (Of course.)
Beyond that, a tank/puller with a clue, and a non-bot healer is best. The actual classes matter little to me, any well-played class is better than an "iffy" person of a "prime" class.
I'm often LFG, so if you want a good non-bot bard/beastlord, look me up