I've used the builds listed above, and there's a reason they're often recommended. They're good builds, you really can't go wrong using them. It would help if we could see your gear though, as your DH currently appears to be running naked, but the builds above work for pretty much everyone ;)
I've found that I personally am a bit faster (and have the most fun) using this for MP0 or MP1 solo runs:http://us.battle.net/d3/en/calculator/demon-hunter#aSgehd!ZXb!ccYcZb
It helps to have at least 5 pickup radius, and around 45% crit helps for Nightstalker. You also probably don't want to be too
glassy as it's fastest if you're able to plow bodily through mob packs; Shuriken cloud takes advantage of this as well. Vault breaks jailer, does not break Strafe, and the TA bonus applies while Strafing.
Strafe on its own is pretty lackluster for damage, but the grenades the Demolition rune fires autotarget, they don't fire into random empty space (you can see this clearly if you're strafing past a single enemy such as a Goblin, a steady stream of very quickly fired grenades all going to the same place). The only time they'll really miss is when you're dealing with just one or two very fast moving mobs in which case HA or Bola are going to be better, as the grenades fire where the enemy is, not where he is going to be ;) Other than that, I might as well not have a primary bound.
I like being able to be on the move constantly without stutter stepping to maximize forward momentum which for me gets very old after a long farming period. So it's probably fair to say that I like this build because I am lazy.
I earn about 47 million exp/hr using a variation on the Alkaizer route, which I'm reasonably happy with at my current dps and movement speed.