Id try the DAC in the Blu Ray player first to see if it suits your ears. A separate Dac should provide superior sound but I would assess your new system as it stands before throwing another item into the mix.
Amplifier or Receiver
I recently bought Klipsch Cornwall IV speakers and am looking to buy a receiver/amplifier to pair these with. I intend to keep a stereo setup for now but want to have the option of home theater for later. I looked at amplifiers and noticed that they do not have HDMI connections. Will that be an issue to connect with other digital devices? Also, receivers may be better for streaming services, etc. I need advice for buying the right amplifier or receiver for these speakers. Budget within $1500-4000.