I am guessing Aragorn either has you very excited to know what you are missing or perhaps ready to throw in the towel. His list reminds me of some holes in my collection and is a very sound advice. I think an M-1 Garandicon might be a good 1st on the list as CMPicon is running low and prices seem to be headed up. I have to go with Aragorn on a K-31 (big five or no) you will not regret picking one up. GP-11 ammo is still out there and they are a mechanical work of art and very accurate.