You don't need a video card. All of the Intel socket 1155 processors have built in video that can bitstream both DD/DTS as well as the newer blu-ray audio DTS-MA and DD-TrueHD. You will need an H61, H67, or Z68 chipset motherboard to use the CPU audio and video.
The AMD Llano processors can do this too.
That said, I agree that a 2500k is overkill.