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to be fair, though the pixel count is higher in the 450D, so is the effeciency. Bigger and better microlenses, and overall better effeciency in the semiconductor means the high QE of the 450D is very good for imaging even with the smaller pixels. Canon strives like all DSLR makers to get the most noise free images possible particularily under low light, in fact this is the battleground of camera makers now, who can make the most sensitive camera. I think that at the end of the day, a modded 450D will outperform a 30D, 20D, 350D and 300D.
Ive once used a SBIG CCD camera, it too has a "live view" where you select an area and zoom in, taking many shots/second, allowing real time very accurate focusing. With the DSLR though one might need to slew to a reasonably bright star to do it, but it will have to be better than taking separate images then inspecting them to see whats best focus, less wear and tear on the mechanicals like shutter and mirror too.
Scott
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