It depends on the money you got BUT I lent myself 30k gold from a friend who's actively playing the auction house (and I hope Ill be able to pay it back with doing daily-quests, I already created a route for myself ...) and bought myself a lot of stuff like:
- Spellshock Necklace, Ring
- Titansteel Guardian
- Deathchill Cloak
- more epic shit
and spent about 15k with it, my shamans are on level 75 now (except for one who is already 80) and the moment they hit 80 they'll be at ~1500 spell dmg, completely unbuffed - now add the Totem of Wrath and the flametongue weapon-enchant I get to something like 1700 (estimated, my level 80 shaman gets to 18XX spellpower without any more epics than the mentioned ones) without any heroic epics and quest blues/greens until then.
If you're interested in it; I planned it here:
http://www.chardev.org/?template=127708

Add 211 from Flametongue Weapon and 280 from the Totem of Wrath and we're at 1941 spellpower without them ever having entered a heroic instance! Its just a lot of money ...

By the way:
http://www.chardev.org/?template=143640
This is the "final"-template when I am done with everything, 2108 spelldmg selfbuffed.

Hope I could help in any way.
I also checked the stats of your tank - they're horrible, it must have been the same with me starting to tank heroics and it was like hell, I bought every epic item I could buy from money (titansteel and stuff) and I barely reached 21k life and horrible avoidance stats.
The tank is just soo important.

Xorn