Prefuse 73 is great if you like glitch hop. Personally I would recommend One Word Extinguisher and Everything She Touched Turned Ampexian the most - Vocal Studies & Uprock Narrative and Extinguished Outtakes are okay but not as good in my opinion.
One Word Extinguisher full album:http://youtu.be/GHcHh6bzIRU
(note that samples don't really do ESTTA justice - the whole album is meant to flow without any interruptions)
For Japanese nu-jazz I recommend Nomak and Uyama Hiroto. Both are similar to Nujabes and both have done collaborations with him.
For Nomak, I recommend Dynamic Meditation (more hiphop based) and Muziq & Foto (more jazz based). Calm is okay but it only has a few instrumentals and I'm not fond of the rap lyrics that the rest of the songs have.
Dynamic Meditation preview:http://youtu.be/OLqC7K8z_fk
Muziq & Foto preview:http://youtu.be/0sp5ytkbpLg
Uyama Hiroto has only ever made one album, unfortunately - A Son of The Sun - but it's still definitely worth checking out if you like Nomak & Nujabes. Out of the three I'd say Uyama Hiroto is the closest to traditional jazz.
A Son of The Sun preview:http://youtu.be/gIWmL6Q4ZcI
I'm a huge fan of Japanese nu-jazz and jazzhop, so I'll be sure to check out Mouse on The Keys. Also liking Colors of Jazz based on >>300