I honestly just collect anything silver and any other coins that I find interesting/cool. I have way more world coins than US coins though, due to them being a little cheaper but also because I'm a huge world history buff.
Big fan of silver threepence, sixpence, shillings. Also a big fan of coins from Seychelles (mostly pre-independence but they have some nice ones after). I don't have a special attachment to that place, I just like the way the coins look.
I also of course have a few silver American Eagles, Brittanias, and Kruggerands. Waiting on buying anything gold at the moment I don't want to put that much money towards my collection (yet)