Interestingly enough, while I'm usually a completionist, I actually wouldn't mind if the Saga of the High Evolutionary were left out. I mean they were not even consecutive chapters of the Saga. But I'll make a page count of the annuals including the Saga.

X-Factor Annual #3: 57 pages
New Mutants Annual #4: 57 pages
X-Men Annual #12: 55 pages
Total: 169 pages

Total with first post: 771 pages

Still leaves some room for an issue or two.

Was the entirety of X-Factor Annual #4 included in Inferno? Or just parts of it?

Samy wants to see the following collected editions:
X-MEN: CLAREMONT/JRJR OMNIBUS, X-FORCE OMNIBUS VOL. 2, 
NEW MUTANTS OMNIBUS VOLS. 1-2, GENERATION X OMNIBUS
PUNISHER (1987) #1-18 OHC,
PUNISHER WAR JOURNAL (1988) #1-24 OHC,
X-MEN: REVOLUTION OHC
X-TREME X-MEN VOLS. 1-2 OMNIBUS, WOLVERINE: HAMA/SILVESTRI OMNIBUS,
LEGION ARCHIVES VOL. 14, KNIGHTFALL OMNIBUS
LEGION OF SUPER-HEROES: EYE FOR AN EYE DELUXE HC