It's good to know that you're providing Linux PCs to those who can't afford them, but let's be realistic - unless they turn out to be really interested in computers, as soon as the kids start working and get some money, they'll go out and buy the same shiny iDevices that all their peers covet.
~95% of the developers I know in the Bay Area use MacBook Pros. The underlying Unix base Apple runs on is nothing to scoff at and the majority of things someone learns about the command line on a linux machine will be the same on a OSX machine. I'm surprised you point out iDevices, what we should be worried about is keeping them away from the Windows ecosystem.
I thought iDevices meant only iPads, iPhones and iPod Touch(es?).