That sounds like just a way bad idea, frankly. It's tricky enough trying to be up to date on hip teen talk and YA books are usually comically "off". If you don't listen to kids talk...kids like the ones you're writing about...or aren't writing about kids from your own youth, you should be extemely careful with this or you look really, really lame.
You are very right about avoiding the lure of transient street slang.
I would recommend YA books, not as a source of particular slang words,
(the OP is not looking for the latest slang,)
but because well-written YA books teach
the technique of working with non-standard language.
YA shelves are a good place to find masterful examples of how to represent slangy, informal speech. This isn't about particular 'hip' words. This is about cadence, sentence length, speed of narrative, Italics, intrusive internals, paragraphing, neologisms, contraction, and non-standard usages like 'gonna' and 'wanna'.