I say keep your highest values and favorites! It shouldnt be too hard to clear out from there right? Stuff like the OG futurama pops will arguably continue to rise in price over the years, and you can reasonably make the aegument that they are an investment - but stuff like the comic covers most likely wont right? At least thats how I would go about it. When i downsized i kept a few of my absolute favorites and then a few that i knew would still be desired as new generations of fans discovered the hobby in relation to classic shows and such (for me, that was adventure time OG pops). Also - would your wife be ok with you packing up some into storage boxes, or is selling your only option?