Range Hero

I like Warlock > Hunter for Solo ranged/casting classes. The Voidwalker is so incredibly good at its job of holding aggro, it's great. Even if it's getting owned horribly, you can use an ability to sacrifice it and gain temporary invulnerability for 30 seconds (or 300-odd damage, whichever comes first), so you have plenty of time to get away or finish the mob yourself. Soul Shards power your crafting of Healthstones and Soulstones for resurrection just in case you get murdered.

My only complaint about Warlocks so far is that most of your spells are DoT, which slow you down, but are mana efficient. Also, the Hunter is obviously better at melee combat as well. I have yet to receive any AoE spells, so I can't really say anything.