One of my all time favourite issues.
Crom - Cyke's awesome in Claremont's first run (X-Men #94-141, Uncanny #142-175). You can get these cheap in the 'Essential X-Men' TPBs. You can also get Essential X-Factor which, from the first issue, has Cyke leading the original X-Men and is well worth a read.
For more modern stuff Cyke's pretty bad-ass in Joss Whedon's 'Astonishing X-Men' run (Astonishing X-Men #1 - 24) as well as 'Secret Invasion: X-Men', 'Avengers/X-Men: Utopia', 'Messiah Complex' and 'Second Coming' - all of which can be bought as TPBs.