What is a great SLR camera and lense for taking sports pictures?

I'm in high school and i'm in phorography classes and i play basketball and am also interested in shooting pictures of basketball.i've had a number of bridge cameras and didn't like them so i'm going to get an SLR. My limit is about $700 and i'm very good with technology so nothing is too confusing for me. I'm also looking at lenses and i know f/2.8 and lower is good and i've found some cameras and lenses.heres what i'm looking at…
http://www.amazon.com/...0012Y89JW/

http://www.amazon.com/...001XURPQI/

http://www.amazon.com/...003ZYF3LO/

http://www.amazon.com/...002OEBTD2/

lense…

http://www.amazon.com/...00005LEN4/

Honestly don't worry so much about the body (although a good body does help), what you want to PRIMARILY focus on is the lens quality. The 50 although fast and really nice you won't get much zoom. I'd suggest the f/2.8 70-200 lens (hold it's value amazingly) but the lens is easily over 1, 000 even if it's been used. Choose a lens that has a good range length with a low f-stop. I just checked and I think your best bet will be the f/3.5 18-200. I only suggest this lens because it'll give you a good range although it is slower f/2.8 it'll still do what you need it to do. I might also suggest when you get your camera and lens that you practice shooting on moving subjects. The easiest to find would be cars passing by. Learn about panning and how to do it correctly. If you spend just even an hour a day or less you'll catch on very easily. Also, if you buy new gear purchase it from www.bhphotovideo.com. They are the best place to buy from anywhere (better than Amazon, Walmart, Best Buy, Target, OverStock, ect).

The best camera would be one that produces images at 3200 ISO with the least amount of noise.

Here are two samples of basketball shots using a 24-70 mm f/2.8 lens, stopped down to f/4 and f/4.5

Why using high ISO's is important is so that the shutter speed is high enough to prevent blur when the players are in the middle of a pay

A 50 mm f/1.4 is fine but when shooting sports, a nice fast zoom lens allows the shooter to compose each shot without wasting any of the sensors area.

For $700, you can buy the latest entry level Nikon D3100

You will have to save your pennies to buy a faster lens than the 18-55 mm lens that comes with that camera.

Since you will not be generating income with your camera and lens(es), there's a lens you may be able to budget for, the 24-85 mm f/2.8~4 for about half of what the 24-70 mm f/2.8. Finding a used one can save you even more

High school gym lighting is not very friendly to photographers. I tend to shoot ISO3200, F2.8 and 1/400 and I think the gyms I shoot in are pretty well lit. Last week I shot ISO6400 at F2.8 and struggled to get 1/320 second. You also need a camera that autofocuses very quickly and you probably want to invest in noise reduction software, like noise ninja.

I know that's a lot but you are in one of the more difficult photography environments - fast action in a low light setting.

Sticking with a prime lens can save you some money to start. In the Canon line, the 50mm F1.8 is a decent low light lens but does not focus quickly so you would want to limit your photos to "medium" action shots - someone standing and dribbling for example, vs driving to the basket. A faster focusing prime is the 85mm F1.8.It also lets you get closr to the action (the 50mm is going to give you a fairly wide view - several players full length, depending on how close you get.