congrats!
I know you got a ton of advice, but your age, experience and confidence level does not match up to a KTM bike. I love them, I raced them and I bleed orange but I suggest you not get one unless you can turn your own wrenches and have the confidence to make em rip. Putz'n around on a KTM ought to be as illegal as it is sacrilegious.
I know a lot of people love those Yamaha WR 250's, bit taller and snappier than your trainer bike, suspension is much nicer and it has decent maintenance intervals.
(it's also fuel injected which is very nice for riding sea to mountain top)
The Honda... whoa I just came across this! I didn't know they made a baby rally bike! How cool is this? (also FI)
http://powersports.honda.com/2017/crf250l/street.aspxI dunno about you but I'm pushing mid 40's and don't need to rip everywhere I go. Now, I want a comfortable bike, low noise, fuel injection and low seat height so I can flat foot it over logs. Ya, I can snap a bike over a 14 inch log at 40 mph or more but I don't want too, I'll be out by myself and an injury could have me laying there for days before I was found.
I know I want a TW200, nothing is better for scouting for Elk in cattle country. I can go down cattle trails in the brush where an ATV would be too wide against the trees, it won't sink in the soft muddy single track animal trails.