I have an error coin, it's just a slab of coin, and you can barely make out the White House on the nickel
If you scroll down the home page you'll see Numismatic Resources click on that and it will help you Welcome to CT
Are you going for the record for the most threads started in a 24 hour period? I can think of a few type coins that you may have missed.
my personal fav is my avatar Belgium 1832 10 centimes NGC MS-65. it is my holy grail. very rare in this grade. or you could go for a 5 centimes... this is mine. hard to find in this grade and this red.