Controlling 2 melee 3 ranged would be difficult IMO. Honestly, I would just spec em all feral for leveling. I'm sure 5 kitty mode attacks will kill anything, and if you wanan go to instances, should be pretty easy, when you get all the stacking bleed effects. Make one more tailored for bear mode, but feral is pretty good to go either way. If you go boomkins you have to wear all cloth, as there isn't much leather caster gear out there just yet. At 60 in outland, gear itemization is better, so you could respec 4 of them, 1 healer 3 boomkin (or do a dreamstate like someone suggested) Respec the first time is only like 1 gold, so you have some wiggle room. You probably will want to respec them all eventually, as you adjust. I know that some skills are very useful at lower levels, but wasted talent points at high level.

I plan on making a druid team, and am hoping for the Dual Spec feature to be awesome, so I can have 5 boomkin for questing/pvp, and respec 1 to feral tanking, 1 to deep resto, and keep 3 boomkins (or even respec them, but a more PvE suited spec than the PvP one.