My son just started hockey and my pictures are very dark and grainy. The lights are dim. Was looking to get another camera and lens to take better pictures. Would like to stay under $5,000. Any suggestions?
If you are shooting ice hockey the exposure is probably biased by the white ice. before you spend any money try to use the camera's exposure compensation to make the pictures lighter.
The Wikipedia article starts with an example which is pretty close to your problem (shooting snowy mountains).
Here are some more explanations on exposure compensation.