Retouch only as much as concience dictates. I know it is very hard not to contemplate retouching. Sometimes there is just too much in a picture and you wish you could just cut it out. But that is just showing off with your PS skills, of which I am limited. A much better strategy I like is to crop with your lens, not your scissors. But you could insert PS where scissors is and it would still be true. But you are in the unenviable position of being satisfied with either one. If you don't retouch, it will nag. If you do retouch, it will nag. And so on...

Drew