I would have thought the D70 effectively superceded the D100, despite being cheaper new and used. its a year or so newer which is a long time in terms of improvements in image processing etc. also the i-TTL flash system of the D70 (and subsequent cameras) is better, new generation. Wireless flash for free anyone? similarly the D200 supercedes the D70, thought it is heavier and more expensive, built a lot better.