Bought myself some Japanese dictionaries the other day after being inspired by @renkotsuban. I got a regular dictionary and a character dictionary, and while I think the character dictionary is very cool (it was kind of a stress purchase), I think I'll probably get a lot more use out of the standard dictionary. I'm particularly happy about the fact that I can access both on my phone through the included app codes, but it's also nice that if they decide to kill the app, I'll still have the actual dictionaries too.
These are both the standard versions from the publisher meant for high schoolers and above, but they also have a series from different editors that's more directed at middle schoolers. I'm sure they're all fine dictionaries, but these versions have more words, so I thought they'd be better for my translator purposes.