I primarily shoot 35mm, medium format and large format. New baby coming next month so its time for a dSLR. I'm considering the Pentax K20D, Canon 40D, or upcoming Canon XSI. Mom has an old Canon EOS film camera she no longer uses. She would give me the 28-105mm USM lens and the cheaper 75-300mm lens she has. Pentax K20D advantages + More detail and usable megapixels (15 megapixels vs. 10 and initial test results show that these extra megapixels are quite good) + In-body IS works with older, used Pentax lenses (like a 50mm I would buy) + Extensive weather-sealing + 18-55mm II kit lens is better than most other kit lens. I would probably at a 50mm prime. Canon 40D advantages + Free 28-105mm USM lens. Doubt I would ever use the 75-300. What other lens would I add?? + Better/faster low-light AF + Better FPS (not important to me) + Broader selection of lenses (probably not be important to me) + Proven, well-tested and reviewed camera Canon XSI advantages + $300-350 cheaper + Lots of bang for the buck - disadvantages: "plasticky" body? pentamirror vs. pentaprism? would order site unseen/unreviewed? Looking for thoughts/opinions to help my decision.