For me it's Amazing Adventures #11-17, which was the original furry Beast arc. This run would set me back at least a hundred dollars on eBay. Yet I'm almost tempted because I remember really liking these comics.
How about you? Any X-related run you wish Marvel would collect?
Is it possible to get that? I saw it on Amazon and Ebay, but they were both kind of pricey. I'm trying to find it somewhat cheap and or discounted. I think that it's out of print.
I also wouldn't mind a collection of the John Francis Moore X-Force run, as that's something that I've heard is really good as well.