I'm looking for a couple of lenses for a Canon EOS400D I recently bought for my wife. I knew about the pending A200 & 450D but her 40th birthday wouldn't wait for the model announcements I'm going to buy her the "Nifty-Fifty" having done some research on these forums. I'm also after an up to around 300mm is zoom with IS for her. A longer zoom would possible be even better, but price prohibitive. This would largely be for wildlife. I've seen some lenses listed as "USM" and I'm not sure what that means, but can anyone recommend a suitable Sigma, Canon or Tamron lens for a Canon please? Price is a bit of an issue and second hand is fine, I'm just trying to work out what to look for. I have a pal who lives in the US, would I be better buying there? I'm assuming the quality "pecking Order" would be 1/ Canon 2/ Sigma 3/ Tamron Is that correct? Thanks, Mark.