You can't go wrong with the 400D. The image quality is excellent, and so are the features.
The 2.5" screen is a good size. The fps shooting is more than ample.
I've used this body with a lot of L lenses and struggled to find any difference between it and a 40D. I prefer the power switch on the 400D over the 40D.
I heard a Radio 1 DJ say that this album is definitely a grower, that was before I bought the album. After the first listen I was happy, it's good but not in the same way as Hot Fuss. Hot Fuss is superb, almost every track is a classic. But it's more commercial too.
After listening to Sam's Town quite a few times now, it has improved so much! One of my favourites. You have to give it a chance, and don't expect the same kind of sound as Hot Fuss