I have a canon eos 400d with a EF-S 18-55 lens at present but require a telescopic lens. i'm on a tight budget and new to photography . i,ve looked at the ef 75- 300 f4-5.6 III usm lens but read bad reports also looked at the EF-S 55-250 4-5.6 IS would this be better or is there another lens that would suit me better. i would be using it to take pics of my kids playing sport and the usual stuff. If someone could help that would be great.Ive seen the EF-S 55-250 IS for £180 at the camerabox isthis a good price?