Ice Bow / Maiden Amazon
With strong crowd control due to Freezing Arrow, the Frostmaiden crushes any area without Cold Immune monsters. While she does run into some single element issues, having a strong Mercenary helps her out a lot. Overall, this build is a fun way to play the Bowazon through Hell.
Video Build Guide
She does not require expensive gear to be effective, but she will lack considerable Damage without her expensive gearset.
If you like playing from a distance and supporting a group or watching enemies stand there as you freeze them to death, then you will enjoy this build a lot.