I'm looking to add a lens around the 70 - 300 mm bracket for the aforementioned camera, but it's a big wide World out there and I honestly don't know what I should be looking for. I don't have a great deal of money to spend, but my good wife is considering buying me an upgrade at the right price. Can any of you good people give me some advice please? I would be grateful for any input. Thanks in advance Wulfrune.