Erm, all cameras have depth of field.
I'm guessing you want to shoot sharp photos with blurry backgrounds.
Basically you want a large sensor and a wide aperture lens. Probably the best bang for buck with be an entry level DSLR with a prime lens.
Nikon D3200 + Nikkor 35 f1.8 DX (I think there's one in the members market at the moment). There will also be a similar Canon or Pentax.