@pcorb: SLI can cause issues with certain games (and just in general at times) so I find it hard to recommend, especially for someone who stated in the OP that this is maybe not something they are super experienced with. If you want the best performance without having to deal with any (read: no more than PC components normally bring) hassle, the 980 is the way to go.
@duncankeller: If I read the OP correctly, I do not think their concern is that such youtubers exist, but rather that viewers are not taking advantage of the many different channels that have different takes on different things. I think what they are expressing concern over is that people may just follow one personality, and therefor potentially not make fully informed decisions.
I am curious to see a 5e game being played. I have yet to actually play it myself or really see it in action, although I have heard really good things. Plus I can only imagine what kind of character Dan makes (my money is on a fighter re-skinned to be Macho Man).