Still ethereum is the best choice for investment. Price is near hand and you can cut a big profit here if you invest on it. Besides, Ripple, Cardano, Stellar are the good choice also. Don't buy dead coin by getting low price. Hopefully your investment will give you good feedback.
For some people, 100 dollars may seem a huge sum, while the others invest in crypto thousands and do not care about hundreds. I think Cardano and TRON are worth investing in them much money now.