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I have had a Nikon D70 which I modified and a Canon 20D which I modified and used (I have modified several 20Ds). I now have a stock 40D and it is a lovely camera. I haven't used or even seen a 450D.
But I would say that I read a post on the Yahoo digital astro group once that to notice the difference in an image with extra megapixels it has to be a large % increase in the number of pixels to be noticeable - like 25%.
So 10 versus 12 megapixels is therefore not really distinguishable in images.
So I would disregard the extra number of megapixels when making the comparison.
Also smaller pixels usually means more noise as you have more pixels capturing the same amount of light and each with its amplifier etc.
Greg.
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