Does anyoe know if/how these two Pioneer 50" screens differ apart from one having a tuner. I hear that the HDE is 8 bit and the MXE is 10 bit. Is all the processing done on the slot-in card? If so, could I take an HDE model and fit an MXE's card and hey presto, or is there more to it than that. I can get a good deal on an HDE so I thought this might be worth a try. All this assumes that the picture on the MXE is better than the HDE. If anyone knows different then let me know. Thanks.