I'm currently developing a FOSS line of robots aimed at tweens, teens, and everything in between. They are not ready yet (work gets in the way!). I know the mar

I'm currently developing a FOSS line of robots aimed at tweens, teens, and everything in between. They are not ready yet (work gets in the way!). I know the marketplace well. Your best bet is to go with a Parallax Boe-Bot with the Arduino instead of the Basic Stamp. The kits are high quality and cost around $150 per kit. They are durable and are extensively documented. One kit per 3 teens is the norm. Anything else will have a bunch of plastic proprietary parts that break and not be as well documented. With teens you want a solid road plan that will keep them interested without overwhelming them. If you have any questions, feel free to email me (profile). :)