Those are some pretty steep requirements for a single portable machine. One thing you might investigate is adding a second machine on/under his desk and running Multiplicity (Stardock product) or Synergy (Free Open Source multi-platform) or InputDirector (free for non-commercial) so that you split the load across both machines and can run dual monitors from each. My biggest issue with the M4700/M6700 has been that the Nvidia cards are supposed to be able to do 4 monitors themselves, but there doesn't seem to be an option to disable the built in LCD and just drive 4 externals.
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