The Brood Saga from the mid-100’s of Uncanny X-Men is pretty valuable. As is most things with Todd McFarlane’s name on it.
There’s McFarlane’s entire run of Amazing Spider-Man (298-324 or so), there’s New Mutants 86 (Cable’s debut) and 98 (Deadpool’s debut), there’s X-Factor #6 (Apocalypse’s debut, and worth around $C600 in great condition when I last checked) and Uncanny X-Men 282 or something (Gambit’s debut). I sold all of these last year in addition to ASM #252, Secret Wars #8 and a few other biggies. But not my copies of The Dark Knight Returns because those are mine.
According to my customers on e-bay, I just listed in that paragraph about $1000 worth of comics, and mine were, had I bothered to have them rated, somewhere in the 8.5 -9.0 range. I don’t really understand why people paid so much because so many of these books were printed, but there it is.