For a dock, I use the Cambridge iD100 and have been very happy with it.
For cables, I use DH labs coax or optical (I seem to like coax the most) and have a silver/teflon cable that was made for me. I go between the 2 coax's from dock to dac and use the optical with a Mac laptop on occasion.
DAC's are all over the place sound wise and I think will bring the most change so give that some good thought. Sorry I can't recommend any.
For cables, I use DH labs coax or optical (I seem to like coax the most) and have a silver/teflon cable that was made for me. I go between the 2 coax's from dock to dac and use the optical with a Mac laptop on occasion.
DAC's are all over the place sound wise and I think will bring the most change so give that some good thought. Sorry I can't recommend any.