It's very difficult! Even I haven't gone down to just 20 and do have some other sets going. I did phase out several coins to help bring my overall numbers down.
I could not do it—what I will do in the next week is post my current “famous favorites.” Actually cutting down is impossible.
I strictly held to it (the B20 concept) for three years, but had to give it up, finally. It's hard, and gets progressively harder as you go along. I don't regret the experience at all, though. It was educational.
You might be surprised. Bring it. Those "Humble Box of 20" collections can be as much or more fun to see than the "Trophy Coin" ones, sometimes.
@Mainebill has some great coins and has posted them before. I'd certainly be happy to see them again.
Ha! He made it sound like he was embarrassed to show 'em. MS66 large cent... PR64 Seated dime... PF64 CAM Trade dollar... the list goes on. Yep, that's a real "Humble Box of 20", all right!
Actually I didn’t want to make anyone feel bad or like I was trying to show them up sorry if I did. Not my intention.
You're good; most of us like seeing all the versions of the box of 20 concept (from beginner to top of the line).