play a few days of Wintergrasp and get the epic helm (40 marks), its quite nice. You can either get one with hit/spell dmg or one with haste/spell dmg. Heres a link to the one i got:

http://www.wowhead.com/?item=44904

This would also allow you to gem/socket more for damage than hit.

Also I would never socket for mp5, its a bit of a waste for ele shaman (good for resto). I prefer #1 spell dmg (runed scarlet ruby), #2 spell dmg/crit, #3 spell dmg/int, #4 spell dmg/stam (based on matching sockets). Don't forget either you can buy a eternal belt buckle and attach it to your belt for an extra socket.

Also imo it comes a point quickly, like really within a week or two of hitting 80, where 50-60% of the heroics become very easy and frankly boring. At that point, if you have the time, it might be better simply to rotate a shaman into a weekly naxx25 pug to pick up much, much better gear. Or your tank, etc. Once a couple of your guys are geared up in the very best gear you can get, heroics become even easier and the really hard ones (spider ones, HoS) more achievable. Plus its nice getting the naxx25 clear achieve on each of your guys, since it makes it a ton easier to join future "geared" pugs.