Darnold9999
Contributor
As a beginner - switching to DSLR I went with the D200 for exactly those reasons. The D70 is a great camera, my partner owns one and she gets great pictures with it. She still prefers the film Pentax but that is another conversation.ssra30:D70s is a very capable camera and its sensor is definitely good enough for a magazine cover so it is definitely good enough for most people. However, D200 and D2X will give you better AF system, more features/options that may or may not be helpful underwater. However, because once you buy housing, ports, strobes, lenses, the price difference between D50, D70s and D200 will not seem that huge so I would consider getting the best camera that you can afford. Most underwater photographers don't upgrade as often as land photographers just because the housing costs just as much if not more than the body in most cases. So buy it once and make sure that it will most likely be good enough for your need as long as possible.
Personally I think D200 probably has the best value for the money. Another thing to consider, D200 viewfinder is significantly better than D70s so that is also quite helpful underwater.
The difference between the body on the D70 and the body on the D200 is about $800 or so. The D200 is a better camera in the long run, better focus system, higher resolution and way more options. The lenses/housing/ports/strobe are all about the same in terms of cost for both cameras. At the end of the day you will have spent a lot of money spending an extra $800 to have a system that is at the beginning of its life cycle as opposed to the end just seemed the best way to go.
If I was just buying the camera the D70 would be my choice as a beginner, but with the added expense of the housing etc I would go with the D200. Both do point and shoot really well so as a beginner I can take great shots while taking my time working through all the options - the D200 will just take longer to learn.
Just my opinion.