I'm going to try HA and Bola as primary and alternate shots and see how that works out. Should be great for heavy AoE needs.
I think at 20 i'll try entangeling shot + Cull of the Weak. Slowing almost every enemy for utility with 15% more damage on them.
I think what I love the most, is you can choose a build and change it immediately if its just not working out.