I wonder could anyone help me? I currently have a Sony A300 and was thinking of upgrading to an A700, but whilst in Jessops a 450D caught my eye, and it felt very good in the hand. I also looked at lenses for it while I was there, and although I had my eye on the 70-300 IS USM, I really think I could only afford the 55-250 IS. My question is has anyone used this lens, and what is it like at the 250 end? I currently use a Sigma 70-300 DG APO, but with RA I definitely need some form of IS. I mostly take images of wildlife (particularly birds, and dragonflies), and less often landscapes and dogs!! Also what are peoples thoughts on the 450D compared to the Sony for my purposes? Thanks in advance for the advice!