I don't currently own an AF SLR. I shoot all of my 35mm with an ME Super, and am looking to pick up something autofocus. If I were just starting out, I would go Nikon, but I already have a very nice set of k-mount lenses, and so I was hoping to go Pentax. The *ist looks like a pretty good camera, and the price is right as well. Does anyone have any experience with these?