Welcome to the forums!
For your HMI, I would be giving groov a solid look over.
Put an ipad in an enclosure and go with that. (Dont forget they are made out of Gorilla Glass, so once in a solid case, they are pretty strong).
When all is said and done, it should be a little cheaper than a PC and touch screen up front, but factor in running and maintenance costs, and you should be way out in front.
If you can get by with a 7 inch screen, then something like the Nexus 7 for 200 bucks should really shine.
Put the touch screen at each oven, and then a single PC in the office running PAC Display for your recipes and long term data logging (and email alarms if required).
groov and PAC Display work seamlessly with our controllers, it really is a plug and play all round solution.
You can email or call our pre-sales team and they can give you a demo.