Yes! Sorry I missed this!
I just read Seconds, and that was great! The Complete “The Couriers” is the most fantastic thing I have ever read, so definitely read that. Most graphic novels stand up on their own, even if they’re part of a series or continuity. For example, Avengers vs. X-Men is really great from Marvel. And there are literally six trillion Batman graphic novels that are freaking excellent (Year One, The Dark Knight Returns, The Long Halloween, The Black Mirror). Infinity Gauntlet is another great Marvel story.
So yeah, that’s what I’d recommend, I guess. Keep looking around if you want more! Recommended lists on comic sites and comixology and stuff are actually really helpful!