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canghuixu
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Are you using any noise reduction software? In many cases, you could push the ISO to 1600 or even 3200 and get decent results. Noiseware, Noise Ninja and Neat Image all give much better results than the noise reduction features of Photoshop. Remember too that for street scenes like these, some noise is not really a problem.
The 5DII will certainly give you better results, but it's not cheap. I just started using Noiseware on a 50D and I have gotten some really good results at 3200 and even some passable shots at 12,800. The 50D is a little better about noise than the 20D, but it's not a huge difference. I think all of the noise reduction software vendors offer free trials and their products are under 100 USD, so you might want to give them a try and see what you think.