So I'm thinking of upgrading from my sony dsc-f717. I'm by no measure a pro, but constantly learning and as humble as possible, I have to say I take some descent photos. My concern is the LCD on the DSLRs. On my sony, I can get a preview of what my shot will (to some degree) look like. IE - If my f-stop is too high, the screen shows that the shot is dark. Do DSLRs like the nikon D-80 and D-200 or the Canon 40D have that feature? If I purchase one of those, is my only gauge the light meter on the camera through the eye piece, or can I use the LCD screen on the back to gauge my shots to see if my settings are correct?