Perhaps a Mini-ITX type system? They generate so little heat (some of them) that the CPU is fanless. I'd say a 15" LCD for the monitor. Use a CompactFlash card for an SSD with a CF to IDE or CF to SATA adapter (low power).
Don't know about your printer, but you'd probably be in the 20-80 watts range on the ITX board, 20-40 watts for monitor.
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