Bellinger first and foremost. Maybe Tauchman. Neris if you can find someone dumb enough (like the Cubs) to ignore his peripherals.
I'm not sure who else doesn't fall under one or more of 1) too young for it to make sense to give up on, 2) too old or signed for too long to make sense to trade, or 3) sucks too bad to have any value. There might be a reliever in there somewhere that I'm missing.