Old post to answer.
But I think one chould also in this situation thinking about getting a Raspberry Pi.
1) It is small size.
2) It has 4 usb 2.0 connectors. That is allot of possibilities to connect other decices.
3) If you install linux you can easily add JACK to bootloader with your own preferenses. No need for screen when everything is done.
4) It is cheaper then kenton midihost.
5) And this is the nice thing. It can be charged by a usb charger. Think about it, making a little “traveling package”.
I am buying my raspberry pi today. Thinking of charreing some sd card image here later on if the project is a success. 🙂