This link has been my ele shaman bible ever since i respeced at 60.
http://wow-loot.com/shaman.htm
Going for your tide fury stuff, fill certain slots with veterans pvp stuff (back, belt, boots, bracers)that will get you pretty well off, nice dagger drops from the same boss as you will get your shoulders in SH. Pick up a draenic honor guard shield off the AH. Check out the above link for what instances you can find items for each of your slots, by the time you run to collect your gear you should be close or already keyed for the heroics then start there.
I've got on 70 blue dungeon drops, few veterans pvp stuff (back, bracers, belt i will get tonight)and even still a few quest rewards. sitting at 19.31% crit and 528 nature damage, i can keep up with any of the dps in a 70 instance equally geared. Any caster mail items that drop will be yours since we're the only ones that can wear the stuff, just plan item of where you need to go.