I like all of your reasoning, not quite my choice (I'm a gathering power and rending cleave). The only thing I'll really disagree with is your reasoning against Regeneration Master. zt gets heaps of health globes - I nearly always give the lane a sweep on my way through unless I'm hunting and need to stay hidden, and I always kill the healer which takes no time, giving me the health. You dont need to be laneing to collect a health globe. It's a late game ability, and it fits zt very well.