I am far, far, far from an expert but I would go with ADA, SUB, and ETH. I would do $200 for both ADA and SUB and then $600 in ETH. But, the reality is your guess is as good as mine. I think ETH has a lot of long term potential and is a bit "Safer" since so many tokens are based off the erc20 token. Take this with as many grains of salt as you want!