Not sure about East but the most popular currencies on West are Um,Lem,Pul those 3 can get you some good items ,obviously the better the item the more ppl want of a specific rune e.g. ppl want 7 Um for Vex.
What you guys need to do is make your own currency, and trade amongst Zelaron players. It would make everything so much easier. And then try and get people to join you.