Hi all! I hope I'm posting this in the right section... I have been lurking around and viewing the wonderful photos on the forum. I currently have 7 Labradors that I am showing in conformation and obedience. They sort of got me into this hobby!! I had always wanted to take nice pictures of my girls and got a Nikon D50 with a 70-300 f/4.5-5.6 VR lens. Then I went on a trip to Yellowstone, and now I'm in LOVE with taking wildlife and nature shots, as well as pictures of the girls and other dogs, especially at the shows. I am about as new as they come, when it comes to photography!!! I have signed up for a class and workshop (just with our local camera store) and I'm looking to upgrade my camera. I can't decide between the Nikon D90, D300, D700, or D3. Of course, money is a concern, but I want to be able to take shots of wildlife, dogs at shows, dog/animal portraits, as well as landscapes. I know I need a fast camera, and I'm prepaired for a big purchase. I'm also looking into getting some new lenses to go with the camera, so suggestions on those would be great. Right now, I like the Sigma 150-500 OS f/5-6.3. Any suggestions?