Page 1 of Multi-region hacks wanted (Pioneer or Mitsubishi)

Hello all. I`m looking at three different DVD recorders, and will probably decide based on which one I can get a back for.

I wonder if anyone could help me out with a multi-region hack for:
* Pioneer DVR-330-H
* Pioneer DVR-555-H
* Mitsubishi DVR-HE50-W

Thanks very much in advance.