Hello. Well I have decided on my camera, a used Canon EOS Xti in excellent condition I'm getting tomorrow for $300. I'm also getting a used Canon EF 75-300mm f/4-5.6 III USM lens that is also used/excellent condition for $100. I'm now looking for an economical fast/low light lens. I am a beginner, looking to shoot youth sports. I have 6 children ages, 4-14, so I am not looking to shoot extremely fast paced college/pro action. Can anyone with Canon lens experience, lead me in the right direction of a fast/low light lens that is economical? Just a decent lens that can capture some action that is fair priced and would allow me to take decent photos, that I would not be embarrassed to give to other parents or possibly sell. I thank you ahead of time for your help!