Psonic Onyx,Mitsu Diamond DLP or Pion Elite Plasma

I am trying to decide on a TV that I will most likely not put on a wall. I am currently looking at the top of the line Mitsubishi rear projector DLP, Panasonic Onyx or Pioneer Elite. I am interested in best picture, reliability etc. Price is less of an issue if there are large differences in picture. Any feedback would be appreciated.

Thanks