This request goes out to the likes of Joe Fernand, Gordon and MAW as I am looking for help on the 504HDE vs. MXE1 for a high end setup. After talking to a few people including MAW about which unit to go for, I think I have decided to go for the MXE1 as I would like to make the most of a Crestron system I have. This question relates to the expansion slot on the MXE1. What is the best card to go for? I have seen people comment on the Aurora Multimedia card and I just been reading about the Key Digital HD Explorer card which provides two DVI/HDCP, two Component, One RGBHV as well as integration to Crestron. Or am I just going down a blind hole and should I be considering the HDE again. Thanks.