Hi Camera guru's, I have now decided on my first DSLR I am buying a 40D, as something I can "grow into" coming from a Lumix FZ20. My First use is likely to be away in a very sandy, hot enviroment & I have decided to start with an ultra-zoom lenses only so i don't need to carry lots of lenses & i don't have to take the lense off in a hostile enviroment. My logic is if i really get into the DSLR thing I can add other lenses later, but will always still find use for the ultra-zoom when travelling, so it will be a decent investment. So two questions. 1/ Will the lenese below in combination with the 40D give me a good sized step up in image quality over my FZ20. 2/ Which of these lenses should I opt for, as I need a decent zoom for wildlife which is the main subject of my photos, whilst also wanting to take landscape photos!... Tanrom 18-250mm (3.5-6.3)VC (stabilisation) Tamron 28-300mm (3.5-6.3)VC (stabilisation) Sigma 18-200mm (3.5-6.3) OS stabilised or any other ideas? Thanks for your help.