Are these the Armageddon issues that came out back in the 90s or the more recent stuff where The Atom gets dumped into the Wildstorm universe. If you want to show how Captain Atom becomes the Monarch later, that run is kind of important since his views there kind of lead him to adopting the Monarch persona that they finally gave him later on.

Also glad to see Jeff Reid's DC Histories post referenced. Jeff is a cool dude who knows his stuff.