I agree, everything is really cheap right now. I would invest in the big established coins(top 20 in coinmarketcap) because when the market recovers, these will be the coins that will grow back in value for sure.
I think top marketcap coin is the best right now. When everything is cheap, its better to buy good quality coin with big community.
If we spend money in low cap sometime the cheap price can go even cheaper so when high market cap get cheaper, we still have chance to grow or recover and its not like low market cap coin.