WayneLigon
Adventurer
This probably goes without saying, but I'll say it, because not saying it sometimes leads to trouble and tears 
If you go back-issue hunting, don't pay a lot for a book. If you see X-Dude #3 at your local store for $25, resist the urge to spit and go look online, preferably eBay or something like www.milehighcomics.com; I can almost bet you'll find it cheaper.
The days of comics being actually worth anything is over, save for issues (like, say, stuff from the Golden Age, or the Sixties) that are actually hard to find or have some special significance. Most of the X-Men 'hard to find' issues, (like the Death of Phoenix) are in trade paperbacks for a reasonable price, or have reprint runs.

If you go back-issue hunting, don't pay a lot for a book. If you see X-Dude #3 at your local store for $25, resist the urge to spit and go look online, preferably eBay or something like www.milehighcomics.com; I can almost bet you'll find it cheaper.
The days of comics being actually worth anything is over, save for issues (like, say, stuff from the Golden Age, or the Sixties) that are actually hard to find or have some special significance. Most of the X-Men 'hard to find' issues, (like the Death of Phoenix) are in trade paperbacks for a reasonable price, or have reprint runs.