I'm running a 5box shamen team at level 51 now,
all have an (almost) equal build (darn misclick :s)
http://www.wow-europe.com/en/info/basics/talents/shaman/talents.html?tal=55000145000213351051000000000000000000000050053110 05000000000
I've just completed filling the elemental tree and started on the resto.
I'm not sure if I can keep them like this,
but for now I'm able to nuke myself through most encounters.
I just haven't killed maura's princess (immune to nature) and had to give up a ST run because I ran out of Ankhs

I've been doubting a lot about both specs aswell, the mana issue is easy to solve if you can summon a mage at any time.

But if you do want to go for enhancement, the macro which follows and starts attacking works great.
I end up melee'ing mobs quite often,
I have my mouse wheel tilting setup to turn the clones so in the event the mob decide to annoy them it's easy to adjust.

In the end it all comes down to your preference, melee clones will need more attention, caster clones will need a drink after every few mobs.