I'm looking for a good camera? - 1

I'm looking for a good camera, and I mean a professional camera for taking photos. My price range is about 500$ - 2000$. If you have any suggestions please answer (note: need camera for PHOTO not video) .

Added (1). Also can someone tell what all the details like photo sensor size, megapixels, ISO range, continuous shooting speed, Wireless Communication Technology, and Image Stabilization are. Please… Please

Professional camera/lens combinations start at $4,000.00.

You don't necessarily need a "professional" camera, just one that will not prevent you from doing what you want it to do. So until I know what you want to do with it, any recommendation will be based on overall capabilities:
Nikon's D810 is a very capable camera for everything including a light amount of sports, but it's out of your price range. Their D4/D4s bodies are pro cameras for sports, but they're out of your price range.
Canon's 7D Mark II is the best for sports under $5,000 and it's only $1,795. Canon 5D Mark II is great for everything but sports, but it's out of your price range. Canon 1Dx is designed for sports, is great for everything else to, but it's way out of your price range.
The only camera that is good in your price range for heavy pro use is the 7D Mark II - it'll be available in November 2014.
The 7D Mark II has an APS-C sensor which has a crop factor 1.6x. This is one of the reasons why it's considered a great sports/wildlife camera because it makes any lens 1.6x stronger. A full-frame DSLR doesn't have a crop factor so a 100mm lens doesn't change, while the same lens on an APS-C camera will have the same angle of view of a 160mm on a FF camera. Since APS-C camera use lenses with shorter focal lengths than ff cameras, they inherently get a larger depth of field which is a problem when you're trying to blur out the background to separate your subject from the background.
The advantage of APS-C sensor cameras is the extra strength of the lens. The disadvantage is that they don't have the same high ISO performance of a full-frame camera. Although the 7D Mark II has really made this point a non-issue for most. But nonetheless, a ff sensor still provides less noise than aps-c.
This is because of the pixel size. The bigger the pixel, the more photons hit it during any given exposure time. More photons hitting the sensor generates a more powerful signal and requires less amplification by the camera. When a camera amplifies the signal due to a lack of light, not only is the signal being amplified, but so is all of the inherent noise generated by the system itself. It's like turning up the volume on a cheap stereo when no music is playing - you'll hear the hum (noise) of the system. Great cameras like the 1Dx, 7D II, D4 have very clean systems so they don't introduce a lot extra noise, therefore your ISO range can be broader and you'll usable images at higher ISOs. Note - just because a camera has a high iso setting doesn't mean that it produces usable images at those settings. Many have ISO 6400 but their images are bad past 1600.
Continuous shooting - Means how many images per second the camera can take. You also need to be aware of the buffer size which the internal memory. A 10 fps camera with a small buffer will stop taking pictures at 10fps very quickly, so you'll be at 1 fps within a few seconds.
Wireless - On a DSLR, this does not mean it transmits images to the internet. It means it transmits images to another computer. This is used for studio work to allow the client/art direct to preview the work. It's also used by sports photographers to send their work to someone who then edits and uploads the images to the web.
Image Stabilization - reduces or eliminates the vibration caused by your movement. It does not help in stopping the motion of your subject - that is done with fast shutter speeds.

You have some good answers, but from your added comments, it is clear that you need to spend some time * on the Nikon, Pentax, Canon and Sony websites, * learning what the various terms in photography, * what different focal length lenses "see" and along the way, learn the fundamentals of photography.

Just buying a camera with the features you require will NOT necessarily produce brilliant images, You will need to attend a class or two in photography and attend seminars and workshops that cover those subjects that you wish to shoot