Recommendation for a Small (<19" or smaller) Touchscreen Monitor

I'm looking for some recommendations or suggestions for a nice small factor touchscreen monitor to add to my simulator set up. 

My intention is to add it into my pedestal and use it to control Flight One's Garmin 750GTN unit in GA aircraft and perhaps as a ECAM display or general purpose display for external apps like FSCaptain, ASN  etc when simulating commercial aircraft.

I think I might be able to get away with using a USB device but, have no issue running as a stand alone monitor from a second graphic's card port.  Something similar to an ipad but I don't need it to have it's own processor.

Any tip, hint's or suggestions welcome.  I would prefer it to be under $500 and closer to $300 but could swing a bit more for an ideal solution.

Thanks,

Robert