If you like Berserk I'd suggest you read Claymore. It's in a similar vein, even if it isn't as good.
If you like your manga a bit more grown up I'd suggest Vagabond. Its themes are definitely not the juvenile stuff that runs through most of the things you read, but the violence and completely badass characters makes it a good read. Warning for slow pacing though.
Then there's just no way I can read a manga thread without recommending Yotsubato! and Chi's sweet home (where my avatar comes from). Yotsubato! is about the funniest thing I've ever read, all categories, and Chi's sweet home is adorable and cute beyond words. Not your standard shonen manga though, so you might be a bit put off by that.