For me, the best buy during this hard dip are those coins that have already reached higher all time high records. In other words, choose those solid coins that incurred the biggest loss, and yet you are very confident will rise back. There is a bigger profit with this strategy. For sure, these coins will go back to their all time high records and break them. Once it happens, you have already made a good wealth out of this severe dip. The coins you've mentioned are good options as well.