I like all types of comics. Mostly I buy Image comics these days. Superhero related I usually buy DC. Superman, Batman, Wonder Woman, etc. I buy Marvel's Star Wars comics.
Most superhero comics ARE by marvel or dc, but I agree that there are other comic studios who make great stuff that's in that vein. DC has an event right now called Batman: Metal which is pretty good. Image makes a comic called The Wicked + The Divine which is amazing. Valiant is another publisher that also does super heroes. If you like the darker side of superheroes, there's always Watchmen! CB has everything plus back issues and graphic novels so there's bound to be something you'll like, and you can always ask the guys for recommendations too!
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