BTW, JUST RANDOM from what i just read on the thread, but when they referred to the ktm 390 they were talking about the duke, not the rc. Yes rc is "somewhat" agressive compared to your other choices, but the duke isnt.
Otherwise, at your size id consider the 650. Although i enjoy my 500x, the 650 would probably work better for your frame.
But in the end, as it was suggested, TEST RIDE to find your answer
Demo ride season is still in full effect if you feel confident enough to try em out, most of them just require an M2.