Check out my website (below)
I just created a Sproggy v2.7 and v2.7.2 power supply that'll give up to 13A on the +5V line, which should be enough to handle everything (this is ATX as well). If you use the 2.7.2 design you can easily integrate the MPEGBOX shutdown controller into the unused portion of the PCB! This'll satisfy all 4 of your requirements
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IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.
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