NOTE: The following is my OPINION. Nothing more. In it's being simply an OPINION it is really not up for debate.

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Pic. Quality.... Yes, the 300d/10d have ISO 100. The pictures DO look smoother. Whether or not this is a good thing is personal perference. I, personally, feel the images look like they were run through Neat Image and find the images a bit to plasticky-looking for my taste. The 10D images were too soft, even when using my 50mm 1.8 prime! This was the major reason for my switching to the D70. The images from the D70 have more "pop." They appear to have more detail and "snap" to my eye. None of the details appear to be "smoothed" out. In fact, the D70 pics need very litte, if any, pp, while the Canon images needed tweaking, especially sharpening. The 300D images look better to me than the 10D and the d70 looks better than both!
Build Quality..... The 10D is the most solid. It is also very heavy. I am a woman, so the extra weight was noticable to me. The 300D and D70 are both plastic, but anyone that has actually held both knows that all plastics are not created equal.

) The 300D "feels" plastic. The D70 does not. A night and day difference, IMO.
Operation.... I found all 3 easy to use and operate. No issues there.
Speed.... D70 wins here. Hands down. Both the 10D and 300D are very slow to turn on compared to D70. Also image playback is painfully slow with 10D. A little less so with the 300D, but still much slower than the D70. The general speed of operation is much faster on the D70. Shutter lag is similar on all 3 for my shooting style. VERY minimal. Shot to Shot time is faster on D70 as well. I did not perform any true time tests. Again, this is my opinion and I am not stating anything as fact. In my opinion, I found the D70 to operate much faster than the Canons.
Kit Lenses.... This may or may not be relevant. For someone looking to buy a "kit" it may be. The Nikon lens is a really good lens! It is sharp, fast and the build quality is excellent. The Canon lens is disappointing. Sure you can get good shots with it. This is true of any lens. It is
easier to get good shots with the Nikon lens more often. I am very happy with the kit lens.
Kits.... Okay, so this is just something I was impressed with, so I thought I would throw it out there. The actual Nikon kit is very nice! The lens comes with a lens hood. It also comes with a nice soft suede-type bag for storage. A nice touch! A plastic snap on LCD cover is also included. The Canon kit has nothing of the sort. I found the Nikon bundle very nice and complete.
I have to say again, that the above is MY opinion and MY experience with these cameras. Nothing more. Please do not attack me for stating such. I have been a long time reader and short time poster on these forums and have seen many people attacked for voicing their opinions and I do not want that to be the case here. I am only posting to potentially help someone that may be struggling with DSLR choices and
might benefit from my experience.
And with the L lenses it's far superior in every way including
speed! The 300D rocks! The ultimate JAM CAM!
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Sunshine
Oly8080, NikonD70