/a/ doesn't like it when people don't bother to lurk and then show up asking for recommendations.
But I'm in a good mood so...
Kaiji - best of the lot and one of /a/'s favorite shows, along with Akagi
Hakaba Kitarou (I got bored and dropped this but it was still good)
Aria the Origination
Spice and Wolf
This season is just about over and it as a whole it was mediocre. The next season is looking much more promising.