I usually only recommend other people check what I hold myself (though some will not meet your criteria, they are affordable right now with great growth potential)...
ICX
VET
NEO
ONT
ARK
NEO GAS
Good luck!
OP is asking about rank 100 and below but all you've bring here are mostly in top 50 though ARK has been mentioned by OP and yeah ranked below 100.
But sorry that i am not a fan of low ranking currencies ,because I wanna secured my investments and i don't feel i am in lower rank coins.
I usually go in top 1-20 currencies not unless i found new one that attracts my attention .