[The Lone Gunman]

Also: Any 250 you buy will have been ridden everywhere flat out on the rev counter.

I like my KTM (again it is in a niche but I am not selling) btu might I suggest any Super Motard. They have lots of low down torque and are easily flickable in town. Maxes out at 110 but has no fairing so uncomfortable at such speeds.
Not so good for the shorter rider but you should be OK.
You could buy one to learn on then buy a bigger mile muncher later and keep the KTM for town and twisties.