Hi, Finally getting my first D-SLR after using a Fuji s9000 for a while (great camera!) I'm debating whether or not to get a 400 or 450. Are there any significant differences between the two of them? Once I've picked a body, what lens would you recommend I purchase? I tend to shoot a lot of landscape photography, and enjoy the odd macro shots, but limited with cash so I'd most likely be purchasing a second hand lens from a dealer.