This is my all around PvE setup with a good mix of Single Target and AoE Damage with some Utility (CC/Mobility/Buffs). I like focusing on the "archer" aesthetic of the Sharpshooter so I avoid most of the melee skills like Deadly Slash and Blade Storm.
**I don't have snipe yet so I've been using Electric Nova instead
-Rapid Shot 4+ for 100% uptime on applying Amplify Damage debuff to enemies, if you get it to 7 the move speed buff is also nice.
-Claymore Mine 4+ and Arrow Wave 4+ both serve to create space between you and packs of enemies and provide some crowd control. The freeze on Arrow Wave is really nice, at 7 I like the increased cast speed and jump back so it matches Claymore's built in jump back. Claymore reducing enemy attack power at 4 makes it still useful against bosses that are CC-immune.
-Moving Slash 4+ is useful for mobility when your spacebar is on cooldown, honestly all of the lv4 augments sound good, at 7 getting extra Hawk seems like a nice bonus but this is probably the last skill I would level up.
-Arrow Rain 10 deals great AoE damage if the enemy stands still for 4 seconds, it combos great after an Arrow Wave which groups mobs tightly together and freezes them. It still does good boss damage against bosses that don't move around constantly.
-Charged Shot 10 deals great AoE damage as long as you have the 3 seconds required to charge it, it combos great after a Claymore when enemies are coming at you in a line. It still deals good boss damage if you find the window to cast it.
-Sharpshooter 10 is a nice almost-instant damage skill, compared to Arrow Rain and Charged Shot. I have it spec'd to maximize single target boss damage since Charged Shot and Arrow Rain already take care of all of your AoE needs.
-Snipe 10 is probably going to be great against damage against bosses. Right now I'm using Electric Nova spec'd for single target damage, but you could probably swap this for any damage skill while leveling if you have a personal favourite.