As long as you respect it, I think a Zero S would be a great first bike. It does have enough torque to get you into trouble in corners if you tweak the throttle too hard while leaned over, but that's really the only tricky bit about riding them I think. Low speed throttle response is very linear and predictable, bike is nice and light, center of gravity is placed well for very easy handling. The bike has plenty of power even for seasoned riders (I've got well over 100k miles under me and I LOVE this thing!), and it handles beautifully and really inspires confidence. The only bad part is that if you drop it - as most new riders do - you're dropping a $13-17,000 bike as opposed to a cheap learner beater that won't sting as much if you damage it... If it were my money, I'd go get a $1000 Craigslist crapcan rustbucket special, put a couple thousand miles on it to get your wheels under you, then look at something shiny and expensive. But that's my money, your change pocket may be able to withstand more of a beating than mine...
SR as a first bike... ehhhh... that seems like trouble, but again, if you respect it, I don't see why not. 106 lb-ft is a lot for an inexperienced rider, and it's that much more $$$. Only you know your limits, capacity for restraint, and budget.