Yes, please do this with all your location AoEs. Makes life soooooo much easier.
As for Dark, sure, its nuke is PBAoE, but it is one of the best debuffs around. If you can stealth in, no one will hit you while you jump out.
I think Archery might fit you if you're looking at range. I'll hop onto City of Data to see if any other sets might fit your desires. If so, I'll update this post.
Update:
Water, Beam, AR, Archery, and Electric appears to be the choices for all Range attacks.
If you want to go cone heavy, you might look at Energy Manipulation as a secondary. It comes with Boost Range that will greatly increase the length and width of your cones...and who doesnt want more length and width amirite? It also comes with Power Boost which could pair well with Soul Mastery (more cones and -tohit) and it might boost Unleash Potential if you take the Force of Will pool.