All right - I've read numerous threads expressing the wonders of digital photography, and how some people consider us film photographers to be wasting money on a dying technology. So let's say I'm interested in exploring the jump to digital SLR photography. I currently own a Nikon film autofocus SLR with a decent 35-70mm zoom lens - a typical middle of the road camera that does everything I need it to do. How much would I have to shell out for a DSLR outfit that offers immediate response (no 'digital lag'), produces sharp photos, and meets the typical railfan's needs on a two to three-day photography excursion? I'm talking the complete set-up - batteries (taking into account that I live in New York State and do engage in winter photography), sufficient memory to store 200 or more images, etc. Are any of the low-priced DSLR's (Canon Digital Rebel, Nikon D50) up to the task?