I currently have a Pentax K100D super, which I was fairly content with as a start up camera, but have become discouraged with its 'soft' images, horrible noise issues and it's AF. My main interest is portrait photography. I have several MF Lenses and the 2 kit lenses and a 50mm1.4. However, I just had a bad fall with my camera and the sensor is now busted. I really don't feel it's worth fixing and WAS looking at buying the Pentax K7 (around 1,600canadian) But i'm having MAJOR hesitations to do so after reading several reviews etc. So, I'm looking to all of you for some input. I am looking at switching to Nikon. Either the D90 or D300, but I don't know if it will be economical and if it will be too difficult to learn a whole new camera system. I have several ppl requesting I do their portraits, and eventually (after much more practice etc) I would like to turn this into a business. Anyone have any opinions? I'd really, really appreciate some help on this. Thanks so much.