Starting at $2,800 for the camera body.
Even though I recommend the Sony NEX-7 below and use it as my main camera, I understand that we are currently in a transition period where many people like to use bigger, professional DSLRs. I used to have the Nikon D800 as my main camera, and I shot with it for over a year, so it is a system I know very well. If you are going with a big DSLR, this is the right choice! See full Nikon D800 Review.