I like the Kaw plastic fine I guess. If there is anything I don't like, it's the front fender on a KX85/100. It's square like it's from the '80's or something.
I had two ideas. Either trim it a little rounder, then clean it up with a dremel, or run yellow plastic (the RM100 '03-'05 was the same only it had yellow plastic). I would run yellow plastic, then maybe try and find somebody who makes a RM85 (the RM85 fender looks cool) front fender without any holes in it-- where you have to drill your own holes. Then you could just drill it to fit the Kaw.
I'm more inclined to do the KX65 than the 100 for the simple reason that I was going to bring a 65 (set up for an adult) out to the track and use it as a pit bike in order to try and get some pit bike cred for it, and make it an acceptable option. I'm anticipating two stroke 65's to be around after the 85/100's have gone the way of four strokes. Reason being is that KTM built a new 65. I'm thinking that for the tiny tiddlers-- two strokes will stay in place. A four stroke 65 sized bike will be heavy fo a 9 year old to ride I'm thinking.
If everything was equal-- I'd take the KTM over the KX65, but that new KTM is an expensive bike, and the point is that I want a $2000 two stroke pit bike that can keep up with the more expensive rides. I really like the kaw front end and brakes too. The 'Zokes and WP shock are pretty cool on the KTM-- same with the hydraulic clutch. ---L*64