You obviously hang out with some well off kids then!
The original point I made was refuting the fact that no kid would be seen dead at school with a Windows Phone. I just don't think that's true, given I walk past kids on their way to school 3 or 4 times a week and they're all using crappy feature phones, very cheap Android phones, low-end Blackberries or messaging Nokias like the E51. In comparison, a WP phone would look great. The iPhone 4/4S is out of their price range, as is the Galaxy S2. Therefore I think there's a good chance selling low-end WP phones to this market will take off, as you get a lot of phone for your money.
The "what the kids want" thing was saying that kids tend to want the best, newest thing, but that isn't necessarily what they can and will get, regardless of who pays. The 3GS is selling well because it's the absolute cheapest iPhone, not because kids think "hey, I don't want what's best and newest", which is what RedRaider suggested. it's just what they (and indeed anyone else on a budget) can afford *if* they've decided they want an iPhone. And it's *still* expensive, whereas the low-end WP handsets are well into feature phone/crappy android price territory but offer much more in the way of performance.
However, if it were a straight-up choice by an uninformed kid who had no experience and no knowledge between an iPhone 3GS and a Windows Phone and price was not an issue, then yes, the Windows Phone would almost certainly lose.
Everyone happy now?