I own a Canon Digital Rebel XT with the 18-55mm lens that it came with; however, I am looking for a new lens. Can you help me find the lens that I will need for shooting prowrestling from about 40ft away from the ring with giving me great close-ups in the low light circumstances? But the biggest problem is though the lens can not be too big and long. I hope someone or everyone can be some help.

THANK YOU!