I was a huge Fangoria collector as a kid. I still have every issue up to 114(I moved on to other film magazines as I went to film school) -- Saying that I read every issue like it was a film school bible, from amazing interviews with directors of the era to makeup artists to seeing forbidden images(at least for me) from the scariest flicks made at the time. Loved it!
I actually still buy the odd issue when I see them in super high grade and cheap. Some of the keys issues(or at least they used to be) are #1, #9(the mega key for decades, not so much now--I have like 8 of them now-) #10 was considered scarce for a bit as well.
Past that I remember #22, #37,#38,#39,#40, #41,#42 (I have no idea why, but they went for lots of cash back in the day even though they we're super common if you looked)
I know a few from the 60's we're worth a few bucks as well, but can't think of them right now.
On ebay I am starting to see prices rising on Fango's. Not a lot, but kind of reminds me when I was buying up Famous Monsters in the early 90's and everyone thought I was weird. Tons of people collected these books and are now starting to come back to them since they have money as adults.
Talking genre film magazines I am still trying to finish up my run of Cinefantastique's from the 70's on up. I find a lot of dealers have good deals on mid to higher grade horror/film like Fango runs if you ask. Just have to search them out.
Is that a Horrorfan issue I see? I think that is issue #4? But I may be wrong. Gorezone was very cool as well for a few years.
Other great horror film mags I collected...
Slaughterhouse(loved it, Best mag for young horror film makers-- only went five issues)
Deep Red(for the serious film and gorehound)
Fear(UK horror zine)
Film Threat(great indy film mag)
Toxic Horror(another from the makers of Fango, didn't last long)
Video Watchdog