I have had Olympus', Nikon and Canon DSLR's. I like the way my Canon collects color and its settings are the easiest for me to navigate. With that said don't worry as much about the camera body as you do the lens's. If money is an issue get a low priced body and spend as much as you can on the glass. Great lens' are what make great photos.
Also take into consideration that computer monitors are very different. A low priced, uncalibrated monitor won't give you the quality photo any of these cameras will produce. These photos look fantastic on my Apple monitors and look dark on my packaged PC monitor.
Canon T3i