As for "collectible" value, that is entirely on the collector.

To some collectors, and upgraded one would be "worthless", and on new-in-box, never opened would be the "holy grail", not to use, but merely to display; physical condition and stock status is paramount. To others, a new-in-box would be pointless, and only a fully upgraded one would be worth owning; owning to use, not to "show" (other than geek factor,) and physical condition wouldn't be as important; in fact, it might very well be modded.