wood-burning fireplace insert recommendations?

[Zardoz]

I am happy with my Lopi.

Had mine going up 2+ stories using a SS liner. Loved it and almost heated my whole hose @ 2400 sq. ft. This is not the time to scrimp if you want quality. You can do the install yourself if you're handy, and flexible. LOL

[baker5150]

How much would it cost to line 24' of chimney? say 6" For materials? here is what I am working with? What are my options here?, I have a double chimney almost Identical to the one pictured. one goes all the way down to my basement and has a metal cap over where the chimney pipe from a basement stove was. I have a stove that I could re-install into the basement but done feel like carting wood all the way down there.

I'll can look and get you a price tomorrow when I get to my office. You'll need a new cap but it won't effect the basement flue at all.  Most liner kits come with a cap.

[fish vacuum]

A liner is required. They're available from stove shops, hardware/home improvement stores, or online. Some of the online places offer free shipping, which is a good deal for such a bulky item. Modern stoves rely on a strong draft and that draft is supplied by a properly sized flue/liner.
I'm happy with my Lopi but wouldn't shy away from most major brands. If I was doing it again I would take a serious look at Pacific Energy stoves. Lopi uses fire brick for their baffles, and Pacific Energy has a stainless steel baffle. Fire brick baffles are probably used by other brands, but many  use some kind of ceramic fiber board that can warp and wear out. Probably easy to replace, but I like the brick or steel ideas better.
I don't have any experience with catalytic stoves but they are known for getting much longer burns.