Lol, you have more gametime under your belt than 99.9% of the theorycrafters out there..
That said, here is build for you. http://us.battle.net/d3/en/calculator/demon-hunter#WZYXjV!aWe!ZZZZab
Bola is great, switch between radius rune and 35% chance for stun depending on enemy cluster density. The great thing about bola is it is an amazing AoE as well as good single-target. This frees up space for defensive actives and encourages utility passives (like tactical advantage, hot pursuit, archery etc)
AoE = Bola, marked for death (contagion).
Single target = marked for death, impale (chemical burn)
Lvl 51 on start of Hell, this build hasn't let me down at any point and has been very effective in getting me out of trouble with teleporters, wallers, roots, stuns, slows etc which 95% of the time is the reason you die in the first place.