http://wiki.project1999.com/Treasure_Hunting_Guide
It's still a work in progress, but it already has some good suggestions.
P.S. As a 45 Shaman you can now use a JBB (unless you're an Iksar). The price is dropping to < 20k plat, and they make a huge difference: you can literally kill a mob with only JBB (and epic since you have it) damage, so that the only mana you spend on a mob is for the slow. And then when you're 60 you can always sell it for Torpor cash.