Blarg,
Check this and other volumes out if you enjoy the X-men. It starts from the beginning and is now about 60 issues into the series. It's really great stuff IMO if you like the X-Men. The Ultimate series is a revamped comic of many different superheroes (Spidey,X-Men,etc), sort of for new comic readers who want a fresh start. (and don't want to shift through the hundreds of original copies of X-Men and its variants).
If you like Wolverine/want his origin, check out:
Origin, the tale of Wolverine's past. Good stuff.