Strange, i wanted to point you to the faq section but i cant seem to find one on best screens. There are however tons of threads on touch screens
I'm using a cheap $175 8 inch screen. Not the best but it works for what i wanted to do.
The liliput is the common screen here. Also the xenarc. But they are not cheap. they are....i wouldn't say top but better quality then nock off ebay screens.