I don't know if it is your style but some of those half dimes are cool and have low mintages (considering their low mintages their prices are low in circ grades). There is something to be said for an old coin it sort of connects you to the era. My favorite is the NO STARS seated dime/ half dime.
This is sort of off topic, but why not collect the $100 bill itself? Go to the bank, trade your $100 in cash, get a nice pristine example of a $100 bill and frame it... Looking at that can make you go "WOW", too!