Hi, I am looking for a stylus that I can use with my nexus 7 that is particularly good for drawing(I am going to be using the app sketchbook pro). Some suggestions that I have heard so far are the bamboo stylus and the adonit jot pro and many more similar ones. I am looking for suggestions from personal experience in drawing with styluses. Also, on some of the styluses like the adonit one, does the circular piece of plastic ever scratch the screen? Would I need a screen protector? Thanks to all responses!