I too also much prefer 12-17 to 1-10. Even 18 & 19 with the introduction of the Mimic were worthwhile.
If you're considering investing in X-Men MWs, I would go for vols. 2 & 6.
The Kirby artwork in vol. 1 isn'this best work by far, mainly because of the crappy Paul Reinman inks.
Okay, getcher tar and feathers out.