For my projects, I use only AviSynth through VirtualDub for all video (and many audio) processing... it's not easy at the beginning, though!
About JP and JP2 new projects (and extras, maybe), talking with zeropc I've had an idea: why don't use WOWOW video along with laserdisc audio? Also, if WOWOW color grading is off, I could always use the laserdisc for color reference... what do you think about?