Mike,
I can hope the wife would buy it!
I don't think that question can really be answered by anyone, because over the years our taste changes. Even the most beautiful picture, card, autograph, or piece of memorabilia would get a bit boring to admire over time. i think a big part of the drive of collectors is the hunt. The frustration of searching hard for the last card in the set, followed by the, yes...I'll say it, ecstasy, of finding and acquiring the item is all part of the experience. Then once you complete the set you now have to move on to a run of sets or, in Jimmy's case, a run of companion pieces.
Upon reflection, I'm not sure I would take anything with me, because it would just serve to remind me of what I am missing. Like Tom Hanks, I'm afraid I'd be talking to "Wilson" or Babe or Lou, etc.
I also think our passion for this stuff would fade somewhat without others to share it with. The friend and fellow ship of places like this board are part of what makes this fun. On an island who would I show my one item to?
Sorry, just waxing a little philosophical today.
Mark