I have no experience with a cigar
mod, but I would think there must be a specialized ecigar thread on here somewhere.
As far as the Darwin, I've been
vaping since January and I've never seen the Darwin in stock on NHaler's site. You do see them occasionally here in the classifieds, but that's rare. You also could get a Kick, which do seem to be in stock occasionally, and that would give you most of the Darwin experience but without the digital display. I just got one from NHaler when they were in stock for less than a day and I plan on rocking it in an all chrome Bolt.
Hope that helps.