To be honest, I have no idea if the camera's you've mentioned are good since I'm new to photography, but I'm guessing they are. I've always loved Canon camera's though, so that's why I chose the Rebel t2i (or 550D). Since I got it, I've been using it a lot, trying to learn how to properly shoot photos on manual settings (setting the ISO, f-stop, shutter speed, etc.). Imo, it's a little hard at first (unless you already know all the basics lol), but it's so much fun to experiment with.
But just an advice I can maybe tell you (if you're considering the 600D). When I went to buy my camera, I was initially going for the 600D. There's something like a 200$ difference in price, and apparently, from what the people told me at the Camera store, said that there is virtually no difference between the 550D and the 600D, except a pivoting screen. A friend of mine, who has a degree in professional photography, told me to get the 550D, and get a better starting lens, since the kit lens isn't very good. If the pivoting screen is a necessity for you, then get the 600D, but if it doesn't matter for you, get the 550D and use the spare money you would've used for the 600D for a better starting lens. So now, my current set-up is a Canon 550D with a Tamron 17mm-50mm. To give you an idea of the price, the 550D body was 649.99$ + tax and the lens was 449.99$ + tax.
Once you get your camera and a flickr or wtv, let me know man! I'd love to see them.