4 - 4.3 would be my perfect phone size. I use my phone for email, web surfing, text, and phone calls. I don't need a monster 4.8" screen that i really need two hands to use. Also, if the software is good it can make a smaller screen feel much better. I mean the current iphone doesn't feel as small as it could since the touch screen is so nice. Personally, the 4s is easier to browse on than my nexus solely b.c I feel like safari on the iphone runs better than chrome on the nexus (with 4.1).