Hi, you sound very similar to me.
I did my DAS last November, having never ridden a bike before in my life (I'm 36).
Did CBT and das all in 4 days and really didn't have a clue (and still have alot to learn about bikes).
The missus (ex biker chick) talked me into it altho I had always wanted to do it myself.
I can't fault the 650 wee as a first bike, its superb!!! Easy to ride, handles well and has power when needed. V comfy even 2 up and I'm 6'2 missus 5'8. Took mine for a long weekend, missus, pans and top box fully loaded and it never missed a beat and handled really well.
In my opinion it is a fantastic first bike, in fact its just a fantastic bike all round, be it a new comer(like me) or a seasoned rider like most of the people on here
.
Oh and I found the bigger bike much easier to handle than the 125.
Best of luck and welcome.