We have been too busy with few new products and the samples we received for TFT displays did not meet our standards. So here is what I think we should offer to cover your needs. We can create a board with RGB Gadgeteer sockets and the required circuitry and have a header on the board to accept most of the TFT displays offered by http://www.newhavendisplay.com/
Meaning you will get the display adapter from us and the display of your choice (if supported) from newheavendisplays.
I think given the reputation of New Haven among our members, this makes sense. From a Gadgeteer perspective where things really need mounting holes, I think it would be nice to have (also) an oversized adapter that could be used for mounting a display to a holey board. Perhaps there’s another solution to this problem?
I definitely think you should focus on capacitive touch.
@ andre.m - Capacitive touch screens are great for most applications, except for applications (like I deal with) that are in a wet environment. If a blob of seawater gets on a capacitive touch screen, it may interfere with the capacitance measurement, potentially making touch unusable. For applications where water or major surface contaminants may stick to the screen, resistive touch would be better, since they rely on physical pressure to activate.
Edit: I just realized you’re asking more about design implementation on the GHI side of things
Their support is very good. I bought a sample 5" for the first time and the touch was not working properly in the Y direction. After chatting a few times over email with their tech support, they gave me an RMA and I sent it back. They tested and confirmed a default in manufacture and sent me a replacement.
They are not the cheapest, but those 5" and 7" displays are very good.