Danielle (aka photo chick) is exactly right. Each of us chose our "system" or "manufacturer" for a reason. An example of why I chose my system, was first, I was invested in lenses from the film days that could be used on my DSLR, my system arguably has the best weather resistant bodies for APS-C cameras, we have in-body stabilization (hence all my lenses are stabilized, hence cheaper and lighter in most cases), I need the dual wheels for on-the-fly adjustments. Are there some downsides to my system? Yes there are like in all systems. So whether you choose Nikon, Canon, Sony, Pentax, Olympus, etc, its important you look at the entire system to see if it fits your needs today and in the future. Then comes the ergonomics which for most of us is of critical importance. If the camera doesn't feel right in your hands, you will have a tendency not to use it. I see that you are in the Chicago suburbs, so if you want to look and hold the cameras, I would recommend Calumet (
http://www.calumetphoto.com/eng/locations-us/oak-brook.cfm) in Oakbrook. For sure they carry Nikon, Canon and I think Sony. In Rockford, there is Camera Craft (
http://cameracraftinc.com/) and they carry all the major brands including mine, Pentax. I would recommend you do some leg work and visit a good camera store. Fortunately, you have a couple choices in your area. Another thing that you are fortunate to have in your area (and mine) is the factory approved repair centers. United Camera in Bensenville is the factory repair center for most the major brands and Bigston Corporation in Elk Grove Village is the factory repair center for Sigma. I have used both and have been very satisfied with their walk-in service.