I collect GI Joe and AF though I'm not a completest I get what I want and I customize stuff for what I want.
I do collect the comics of GI Joe:
the original Marvel Run including Special Missions and Yearbooks
Everything DD/Image ever printed for GI Joe with the exception of the Transformers crossovers
And all the GI joe cartoon series, Young person novels, and Find Your Fate books.
I collect the The Executioner "Mack Bolan" and most of the incarnations there of: Phoenix Force, Stony Man, Super Bolan series of Action Adventure Novels
http://www.mackbolan.com/
http://en.wikipedia.org/wiki/Mack_Bolan
http://en.wikipedia.org/wiki/The_Execut ... ok_series)
http://en.wikipedia.org/wiki/Phoenix_Force
http://en.wikipedia.org/wiki/Stony_Man
I also collect the SOBs series of action adventure novels by Jack Hild
So toy wise just GI Joe and AF (though I buy other compatible scale toys for custom use)
And bookwise what you see above...
I also tend to pick up any books I find on the Spanish Civil War as well.