Problem with collecting stuff is that it's only worth what others are willing to pay. So if you buy it, it may not rise in value. That is unless in thirty years D9 emerges as a cult-classic and lots of people want it.
But you're paying $600 for a statue. You can't even play with it. If you could pose it and switch weapons and if it lit up then maybe that's worth it. Consider there's plenty of fine collector mech toys from Japan that can do those things for a lot cheaper.
Better yet, buy the materials and make one for yourself. It would be learning process and you'd get what you want.
"Astronomy offers an aesthetic indulgence not duplicated in any other field. This is not an academic or hypothetical attraction and should require no apologies, for the beauty to be found in the skies has been universally appreciated for unrecorded centuries."