Picking up Rolling Thunder is not a bad choice. You basically are manaless. You can solo every merc with out ever stopping or without and assist. You can even solo a Golem, and at the end be full health and 30-40% mana.

You can solo a golem with you build, maybe even a little faster, but you will be oom at the end.

Actually a pretty funny read, great build and able to sustain pretty easily mid to late game. great job.