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Why not just buy any number of Atom or Fusion motherboards out there? Cost is in the same realm as what you're asking for and they already have those slots. Power consumption isn't much more than the ARMs, but there's actual product you can buy today.

If you don't mind waiting a bit, see Freescale iMX6: http://boundarydevices.com/products-2/nitrogen6x-board-imx6-...

I think you're missing the point, it's not about wads of cash, it's about dribbles of cash.

It will no longer be cheap once you add all the stuff you want.