For anyone still unsure of whether they are voting for Newsy Lalonde or Cyclone Taylor, I'd highly recommend browsing through the discussion for the last HOH Top 100 list. At that point, it was pretty much considered historical canon that those were the best two players of the pre-Morenz era. The only arguments were as to which one of the two were better and just how high they should be ranked against more modern players.
IMO, those two players should be shoo-ins for this round.
Arguments for the other two guys I'm currently planning on voting for (Nighbor and Bowie) are a bit more complicated. It's not historical canon that Nighbor is better than Joe Malone or Cy Denneny, but if you examine his career more closely, I'm certain that he was better than them. He really was considered the true superstar of the NHL's first dynasty. And I do find it interesting that Joe Malone's record setting season was largely due to beating up on Ottawa when Nighbor was out of the lineup due to bereavement leave. Once again, please see Nighbor's profile for details.
And prior to WW1, there really didn't seem to be any difference in quality between elite amateur and pro players. And Russel Bowie is the best amateur hockey player in history by far. So he gets my vote over any pre-WW1 pro player.