I'll take this in a bit of a different direction. Other than the obvious 1804 dollar, 1913 V nickel, etc... I like the Jackie Robinson $5.00 unc coins. they appeal to sports fans, civil rights/history buffs, and of course us coin nuts. and very low mintage for a modern coin.
The one piece that comes to mind would have to be the 1793 America Reverse in MS-65...that would be very nice to throw in the 'ol vault.
Yeah, remember when I said I wanted that Flying Eagle Cent in my dealer's shop? Yeah, so I broke down last time I was in there and bought it.... I'm so very happy with it! Now I want to find a nice case to display it in. Any ideas? ~AJ