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Congratulations Tandum on your new purchase, I'm sure you'll be happy with the 450D as are others on the forum.
Personally though I would choose the 40D if I had a choice.
People tend to look at megapixel count but don't realise that squeezing more pixels onto the same area increases noise especially for astro work.
12MP vs 10 MP won't produce significant increase in detail but will affect noise especially at higher ISO settings.
The weight factor too is not an issue IMO between the two models for astro work. If your mount isn't upto carrying the 40D with any associated lens' and filters etc, then putting a 450D will have it operating too close to it's threshold anyway.
If you have a sturdy enough mount, having the better build quality of the 40D will assist in dampening mirror slap and on those windy nights give the camera better stability. Of course this is only a minor point but one that should be considered if the difference in body only price is small.
The final point is that, IMO, the 40D is a better camera to hold and handle for terrestrial shooting too.
Don't get me wrong, I wouldn't knock back a 450D if that was what my budget allowed when buying a new camera especially since it has live view, but I wouldn't go out to replace my old 20D with a new 450D simply because of megapixel count.
If on the other hand I was contemplating replacing the 20D then the 40D would certainly entice me to do so over the 450D if the body only price was not too dissimilar.
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