I had a 400D, and moved to a 550D, and the difference was dramatic, much bigger than a single model update should have created.I don't think that there was much of a shift between 400 and 450. You might find that an OS lens will help, and give you about 3 more stops of exposure (before it blurs through lens movement). If you want a faster shutter speed say 1/500th then open up the aperture, at the cost of depth of field whilst maintaining a decent ISO to avoid noise. https /I'm not sure what you are trying to achieve, but I know that you have a good enough understanding of the relationship between Aperture, shutter speed and ISO. Looking at noise at high ISO is important, and their reviews are very detailed. DP review, is a great place to look for reviews.
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