I own an ’09 650 and I love it. I’m 5’11 and 150 lbs, it fits me like a glove. So I’ll put in a good word about that, but maybe not as a first bike.
Good call on the CBR, that’s not a beginner bike. That’s a crazy-fast race-bred rice rocket. It has less displacement than some of the other bikes, but don’t let that fool you. It has an in-line four cylinder engine that makes more power than you’d ever need on public roads .
Seems like you’d do well on the ER-6N. Same engine as the Ninja 650 though, lots of low to mid-range power which has caught me unawares a couple of times. The ER is like a quarter-faired version of the Ninja, so you’re going to miss some of that wind protection on the highway.
Have you thought about trying out the Ninja 500R? Its the often-overlooked step between the 250 and the 650. The design hasn’t really been changed that much in the 18 years its been on the market, so its drop dead reliable. The looks aren’t all that sharp anymore, but its an excellent first bike.
good luck on your search!