The 450D will be out by April and probably a bit cheaper than the 40D.
SD card and 12 .something mega pixels versus 10.something for the 40D.
It is between the 400D and the 40D.
Both have live view.
Then there's always Nikon and I know Omarroo swears by them and I value his opinion.
Somebody please try and convince me which one to buy

I'm going nuts and confuddling myself the more I look.
I will be using it for both astro aswell as general happy snaps at this stage.