I'm sure this has been asked a thousand times already, but I keep finding older threads (2008, etc.) I was wondering which you guys prefer? I am aware of the better LCD screen on the 50d and a few added features, but is there any real difference in IQ? I could get a new 50d for $975 at B and H or a used 40d for >$600 elsewhere. $400 is a nice chunk towards a new lens, but would like to hear what you guys think. For reference, I shoot a lot of different types of photography, but am currently working in sports, so how usable is the higher ISO on the 40d? I'm a Nikon shooter, but the FPS from the 40 and 50d is very appealing for the price.