John, to freeze the action in indoor sports like basketball, you need a shutter speed of at least 1/500 for players moving toward you, and 1/1000 of a second for players crossing your field of view. The way most high school and many college gyms are lit, that requires a lens with a maximum aperture of f2 or better, which means a prime lens, not a zoom.
If you can position yourself behind the baseline to one side of the basket, you can get great shots of the action in the paint with an inexpensive 50mm/f1.8 or a mid-priced 50mm/1.4 lens. When there's a stoppage of play, shift to the side of the key away from the low referee, or his butt will be in every shot. If you shoot at the top of the players' jumps for shots and rebounds, the players are nearly still, which improves your chances of a sharp image.
An 85/1.8, 100/2 or 135/2 is also great for action in your end of the court, shot from the baseline or sometimes the corner. My 200/2 is outstandingly sharp and fast, but it's too long for shooting from courtside. Shooting from the stands is not a good vantage point in most gyms for several reasons.
A frame rate of 8fps is also handy for short bursts of 3 shots or so to improve your chances of getting publishable shots, although 5fps will do.
The same lenses are also good for volleyball, if you can shoot from near the net on the referee's side, not the linesman's. The 50mm lens can get good shots of net action on your side of the court, and the 85, 100 or 135 can cover the other side. If you have to shoot from farther back, the 200/2 is superb, but they cost close to $5000.
Some gyms have two lighting intensities. If you can persuade the home coach to crank it up the higher level (in exchange for lots of free publicity shots), you usually gain 1 f-stop, the difference between 1/250 and 1/500, or 1/500 and 1/1000.
I shoot Canon, but acknowledge that the top Nikon bodies have had about a one-stop edge in usable ISO for a few years, especially with the D3. You can now get a used D3 in excellent condition on www.fredmiranda.com for a reasonable price. Canon's 1 Series bodies are certainly adequate. (Note that advertised ISO claims do not mean much). I've used a 1DMkII for years, and the noise level becomes excessive above 1600ISO. Noise from my 5DMkII is acceptable up to 2400ISO, about the same as the 1DMkIII and MkIV, but the 5D frame rate is slower. My friend's D3 is usable to 3200ISO.
Hope this helps.