As mentioned above, the most important part of moving hot air somewhere in the house is having a good way for the cold air to get back to the stove. Without a complete 'circuit', it won't be possible to move enough hot air 30' or so to keep the next room warm.
As for inline ducts, the $25 hunk of junk inline fans move about as much air as a fly beating its wings. Been there, done that. I bought two and installed one. It died within a month or so with 24hr running. The other one I gave to a friend to use for some part-time use he had, like paint room ventilation or something like that.
Once I figured out I had to have a complete air circuit in my house, I decided on a couple of really great 405 CFM fans for 6" duct. Here: http://www.iaqsource.com/product.php?p=suncourt_tf106&product=112180
. They are super quiet and have been trouble free for the past 2 years. They can have an optional speed control, if desired, but I just let 'em run full speed ahead. I pull air off the top and sides of my Channing III and heat a 200 sqft cape cod house to 70 degrees without any problem.
Yea, the fans are pricey. I first paid the price of doing it wrong the first time, both in non-circuit air movement design and cheapo fans.
edit: Oh yea..I 'pull' cold air through ducts as the fans are adjacent to my stove. That way, there's no hot air issues.