Baccano! - A moderately paced action/ suspense show. If you like Darker than Black and Death Note, then you should like this. It's told out of chronological order, though, and that puts a lot of people off as it is a bit hard to follow.
Durarara!! - Spiritual successor to Baccano!; longer, more refined, but ultimately not as good. It's about a suburb of (?)Tokyo, and the interesting and disparate characters who frequent there. Love it for the way it makes the city out like a living entity.
Berserk - Absolutely horrid animation, but if you can tolerate that it is a truly beautiful story with many layers, and a good deal of gore when it's called for. Set in a high fantasy world, except for the first episode's dark fantasy corrupted world.
Black Lagoon - A show that seems more tailored for "western" sensibilities, about a mercenary group. Lots of gun-toting action, and well fleshed-out characters. It consists of a number of vaguely related story arcs with a wide range.
Fate/Stay Night - a modern fantasy series about mages who compete in a war for the holy grail by summoning the heroic spirits of legendary warriors. The anime isn't actually that great, but the franchise as a whole is excellent, and this is as good a way as any to be initiated into it (or to see if you like it at all).
Fate/Zero - Prequel to the above. It is recommended but not necessary to know the story to Fate/Stay Night beforehand. This anime is truly excellent, with very good animation throughout, an engaging cast and an emotionally affecting storyline. Not without issues, but one of the best things I've seen.
The Last Exile - This is a bit of a stretch based on what you say you like, but it's well worth a mention. Great steampunk world and appropriate atmosphere, put is poorly paced and the story goes into a major lull halfway through. Recommended for steampunk fans, though.
Neon Genesis Evangelion - Dark, psychological, reflective, giant mechs. Extremely divisive, but something everyone should give a go. Some people don't like the slow pace and spineless (but not without justification) main character. Great representation of what would really happen if you put the fate of the world on a fourteen-year-old's shoulders.
Paranoia Agent - A show about collective consciousness in a media-saturated society. Slightly predictable, but only because it follows its theme in an internally-consistent way right through to the end.
Planetes - Near-future, hyper-realistic sci-fi. Terrible first few episodes, but becomes one of the most affecting shows I've seen. Themes of loneliness, aspirations, and the consequences of a heavily globalized, capitalist world.
Spice and Wolf - Another stretch based on what you listed. Consists of a merchant traveling around a medieval world with a pagan wolf-goddess as his companion and their conversations. Very witty dialogue on the whole and... Economics made interesting..?
Tiger and Bunny - Heavily influenced by the western super hero tradition, set in a city where super heroes have become commercialized and star in a reality TV show. Good mix of action and drama (but emphasis on action, with some nice animation).
Welcome to the NHK - My personal favourite. A dark, psychological drama about a shut-in. It kind of requires you to be reasonably well-versed in all things anime to really appreciate, but if you can personally relate to the main character, it will hit you like a bomb. The most depressing thing I've ever seen. You can tell that the book the show is adapted from was written by a real shut-in.
Mahou Shoujo Madoka Magika - Also called Puella Magi Madoka Magica. Basic premise of your typical magical girl show, but shown through the lens of the Faust story. Very dark, and if the art style doesn't make it completely unwatchable, then it comes highly recommended to absolutely everyone who likes an emotionally wrenching story. Personally, I think the art is one of the shows strongest assets because of the contrast with the content. Could use some better animation, though. You'll know if it's your kind of thing is you watch 'til the end of episode 3.
Oh god that was a long type-up... But I'm fairly confident those are similar enough to what you listed that you can find a couple you'll like based on my descriptions.
