Criminal Minds is my favorite because I'm way more into the psychology/sociology of crime than I am in forensics. the CM spin-off Beyond Borders has been pretty good so far too.

The original Law and Order is a classic for a reason. Though I'm more interested in the lawyer half than the police half, so the spin-offs are only sometimes enjoyable to me.

I loved Castle right up until the end.

I'm not sure what show would work best with captions. Maybe Law and Order because it moves fairly slowly?