Alternatives to iPAQ or Yuma, etc.

Now that trimble and farm works are together, it seems they could offer another option to replace the iPAQ. I would like to go to RTK and need either a cell modem or something like a tablet PC to hook up an aircard. I need more ports for this option than the iPAQ and sure don't need all of the features of the Yuma, such as built in GPS and the rugged case (the iPAQ has worked fine without a rugged case when ram mounted in the cab). The Trimble receiver that I will need for RTK already has GPS, but doesn't have the Farm Works Mobil. I have been searching on line for other options to replace the iPAQ so I can plug in an aircard to get RTK from CORS in Michigan (this seems to be the best option with the woods we have around our fields) and then output the data to the Trimble (I forget the model as I don't have it yet but trying to find the best options) to run the EZ Steer or auto steer. I wonder if you could give me other options that might work.
Thanks
Kermit