Ignoring the inputs of your monitors, its the Windows settings are the issue; if you have 4 active DVI outputs then you can have 4 monitors connected, all separate.
Plug one DVI into the TH2G, the rest into the Monitors directly, that gives you, in Windows:
One super Wide Monitor
3x single normal monitors.
You could have these active all the time (but wouldnt as you are already using the physical monitors with the TH2G).
So you could use Windows to disable the Super Wide desktop leaving you with the 3 or disable the 3 normal desktops leaving you with the Wide one. This is assuming you have correct inputs on the monitors and ideally they autoswitch to the active display (lest you have to manually do it, physically per monitor).
Regardless, thats a lot of dicking around in Windows to switch displays (effectively you arent even switching display, just res), I wouldnt bother with it, in practice it would likely drive you mad.
That 23" still looks excellent, I would seriously consider it and run it downscaled. And I hate downscalling, but it might be worth it! Better resale when/if you upgrade, better if you decide to run Single or Dual screen at any point, better if Matrox make a high res TH2G, better for SoftTH, better contrast etc etc. With such a high native res, it should still look good, noticeably better than a 1920x1200 screen, which really isnt that bad.
_________________ [GTX1080 - 4.48GHz 4690k - planning projector mayhem]
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