What are your choice for the front screen of an iPhone4? ....Screen Guard. ....NO Screen Guard. Is it really necessary to protect the Gorrilla Glass that is on an iPhone4? I know that glass scratches....but what is it like for the Gorrilla Glass? I have a screen protector on it currently. I am ok with it...but I don't think it will work well with my new TPU case I got. Looks like it is going to wrinkle the edge. What are your thoughts about going without a screen guard?