timetesh makes an interesting point, but I know folks who buy lots of "items," including cars, just to put them away for years.
With your clarification that there were only 207 Mod 15-8s made I more clearly see your consideration. Since it was made in 2001 does it have an internal lock (your photo doesn't show it, but I see that colt_saa's doesn't). If so I'd certainly hide the Mod 36-6 away.
Also, there's something about the phrase Chiefs Special Target that rings louder in my ears than 15-8, although I did finally see that your 15-8 is a Performance Center piece so that makes it a bit more interesting, I suppose.
My two bits,
Bob