Altcoin that is right for investment with a capital of 1000 $ is an altcoin that is in the top 15 in coinmarketcap but if I am in your position, I'll buy 35% Ethereum, 35% Neo, and 30% Cardano.
Yeah, OP has a good amount of capital but I think its too risky to invest in this market if you will just depend on any suggestion. For me, Altcoins is the best investment right now because of its dump value, but never depend on any advice start learning on your own, on how to invest in this market. Your capital will be gone if you don't know hot to properly invest that money.