Maybe you should ask yourself some qns.
What do you want to use your camera for? (sports, family, landscape)
What do you expect your camera to have? (Features, functions, accessories)
Have you got experience in using SLRs or DSLRs before?
What is your budget for your camera, as these bodies are semi professional, and relatively more expensive than consumer orientated cameras like 400D/ D40X (They still take great photos).
If you can think about these qns, you will find that making your decision on which camera to buy easier.
Try searching the forums for such threads and draw conclusions from there, as these A vs B threads has been discussed quite often.