Yes to the roundover on top edge. My understanding is that it works in the same way as vertical edge roundovers which affect edge diffraction. Sharp edge is less desirable, but not a absolute deal killer. I know Danny has measured such and perhaps he can comment.
As to looks...to each their own. I like thinking outside the norm, but visual appeal is all about individual perception. To my eye, the bevel and roundover combo look odd, the primed cabinet less so, perhaps because the bevel follows the roundover around the corner. The others look more balanced. I suppose some of the difference in appearance depends on whether cabinet will be wood showing or painted. I do like the monolithic look of painted cabinets with all corners rounded which strikes me as a more contemporary design.