I've got a Zune 16 and would love to be able to trade up to a Zune HD. Please, please add this as an option! (if not for me, for all the other Zune faithful over the years, too)
As a side note, the Zune HD really needs quite a bit of additional capacity, before I could consider dropping my Zune 80 for one. Besides, if we're really putting much HD content on a Zune HD, 32 GB is not going to hold much of a library...