I came here to recommend (1), (2) and (6) - and frankly, I prefer both Mike Duncan's and Robin Pierson's style over Dan Carlin's, as the latter easily becomes grating to my ears. Give me Duncan's deadpan humor any day.
I also prefer Duncan and Pierson to Carlin, but I have come to accept that I am in the minority. I have not actually listened to the last few Hardcore History episodes because I can't handle Carlin's "quote voice"
I look forward to checking out your podcast! I'm just following Mike Duncan's Revolutions podcast and he's nearly up to WWI historically, would be a nice segue to new content.
Thanks for the other podcasts, by the way!