Dragon Box Z
Been watching it randomly, mostly the Majin Boo arc and have to say that the tweaked colours on my HDTV do make it even better with the blue skies and all but even with the green tints and all I'd be okay. I'm not anal about that.
I do feel like the Majin Boo arc could have been the true sequel to Dragon Ball Z because it feels different enough and advanced to be a new series.
The only thing that's not too great is the muffled Japanese audio but I've gotten used to the muffledness so I'm fine with it.