This may or may not fit your use case, but I would at least consider using Samsung Chromebooks.
[Love Samsung Glass]
Low cost @ $350, supports larger display later that can be wall/swivel mounted, instant on, much less security/maintenance issues, and since the app doesn't reside locally, upgrades become more manageable for all those locations. In the event of theft or loss, replacement time is far easier. If you are used to using it on other devices, it supports multi-touch gestures and a webcam/integrated camera [documenting, tele-presence medicine, etc].
You can use wireless, or attach a USB NIC.
