When I started looking for doctor who models years ago it took me forever to find them, now with the new series getting more doctor who fans then ever I thought I would share the key model companies i use for doctor who models.
These dalaks are shapeways 3d printed 32mm daleks that fit into my Malraux sized range. I am currently using them as Wardens. Since I bought these models shapeways have come out with other dalek war themed models, including an empire dalek based of the new series. But for now I am happy with my three dalek wardens. http://www.shapeways.com/
My tardis is from the black tree design miniatures, They have a lot of classic doctor who miniatures done in a scale that lines up mostly with 40k. There line of models is massive and you can find just what your looking for, classic doctor who wise.
Next on my painting table is a model form the Heresy miniatures line of doctor who models, the 10th doctor. I just finished basing him so here is a photo from there website of the awesomeness.
Well those are the main places I know where to find Doctor who models I hope this helps the Doctor who fans out there. Leave a comment below if you know of other sources of doctor who models that I didn't list.