How about this plum one? We got this for DS when he was two. A bit bigger than a mini one, but not so big that it dominates our small garden. It can easily be put on it's side against a wall/fence if you need it out of the way too.
I wasn't so keen on the ones with handles - I had visions of him tipping it over or bashing himself in the face.
looks great but would be scared of her falling off?? did you put loads of cushions round it when he first started using it? DD has excellent balance but she is so energetic that i would worry a bit about her coming off if she got too excited.
It does look very well made. Good that the bands/cables are covered. Has yr DS had any accidents on it? our garden only has decking so she would mostly be jumping in the tV room or basement.