Help... what DAC for Samsung TV

I have recently bought myself a UE40ES8000, TV is great, loving the picture quality

However, sound on these things although passable for regular TV viewing is not up to scratch for Movies.  In an attempt to beef up the sound, I have connected the telly to my NAIM Nait 5i through a neet DAC, but the sound is still not very powerful.  To get anything meaningful out of it, I am cranking the volume up to halfway on the Amp

I was just wondering if getting a dedicated DAC would help beef up the sound, I was thinking of something like the Cambridge Audio DAC magic, but would this be overkill and more to the point would I be wasting my money.  I am not overly concerned about the sound quality, I dont watch many movies, just need something to make the telly go loud more than anything else

Anyone have any suggetions?