Hybrid Ranged by Power Source

[ZickZak]

Hello,
we houserule 4e a bit
- mainly whatever power source class you pick, you can pick powers from that power source, except at-wills (rogue can take ranger, warrior etc powers, all martial ones)

What would be the best combo for ranged steady DpS? Currently using Drow Binder / Ranger (Darkstrider), for invisibility and Darkstider Edge ombo, and Merciless Killer, Lasting Frost bumb.

Only one magic item allowed - Frost Longbow in my case. Char Level 12.

Thanks