I am still shooting with the kit lens with my Rebel XTi which I replaced my XT about 8 months ago with. (got to love Costco's old return policy). I definitely want to get a 50mm lens as they are so fast and excellent in low light, I was debating about picking up another lens as well. I primarily shoot my son and niece and nephews. I am very attracted to ultra sharp and detailed shots. I tend to like zoom-centric shots as well so I was considering the 300mm IS lens as well. Are the lenses like Stigma as good as Canon brand lens? If detail is extremely important, should I consider a non-canon lens to save money?