Sounds like you got a great deal. Since you're new and you listed certain items, I would suggest that you go down to your local university and talk to anyone at the EE department about whether the various wires you obtained can do anything special (I know what they'll say, and I agree with them).
The DAC matters. The Apple TV is OK, use the digital output and feed the DAC with it. I don't know the DAC you are looking at but it sounds like a good one. Welcome to our hobby!
The DAC matters. The Apple TV is OK, use the digital output and feed the DAC with it. I don't know the DAC you are looking at but it sounds like a good one. Welcome to our hobby!