Get all three!
Seriously though, they all sound great (I know this is subjective). I have a Nyx V1 and Typhon. Would love to get an Erebus too but I have a serious Eurorack habit to support. If I was just dipping my toe into the Dreadbox universe, I’d probably start out with a Typhon and go from there. That said, with a bit of searching, you might find a used Erubus V1/V2 or Nyx V1 for a similar price.