Stereo Receiver for sound
Sources - iPort, 2 DVD-players (Maybe a 400 disc Sony), 4 cameras

Question: How many zones? Are there local stereo receivers in those zones? How many speakers in each zone. Do you want one TP to control the entire system? Do you want feedback via iPort? Do you want the sources to have their video fed to the TP? Do you want to be able to manipulate the iPod via a PC?

The system does not sound too bad, but you need to answer these questions. If you want the logic to control all of these sources intelligently with feedback, you will need Crestron, AMX or Elan. I am sure it can be done with the Xantech SPLCD 6.4v, but you will be limited to feedback. Although the SPLCD v has a video input you can use as a poor mans form of feedback.

Mike