I was wondering how big of a print i can realistically get from a 5MP camera (a panasonic FZ20 or a Nikon 5700) Me and my friend are going 2 open up a photo retouching/restoration business, and eventually if all goes well, we'll start doing senior/family portraits and stuff like that. so should I just wait and get the Nikon 8700 8MP camera or something like that?