I would like to have a computer

I have the Node 2 DAC, connected to a NAD 1600 Receiver/PreAmp, which runs to a McIntosh 2125 Amp, which powers Sansui SP-3500 and Optimus – 1100 speakers in an A+B set up.

 When building out this listening room I ran a hdmi cable from the stereo setup location to my tv on the other side of the room.

1) I want to be able to plug the HDMI cable into said computer and send lyrics utilizing Genius/Spotify,  and play  DVD’s to the tv screen.

 2)  I want the audio portion of the DVD’s while playing on the tv to run thru a USB cable to my DAC to my stereo.

 3) I want to use said machine to rip and store my cd’s, download hi res music, store it, and play it thru my stereo.

I don’t know how to do this, or even if it can be done. Can I buy a machine off of the shelf? Will I need to make the machine? If I need to make the machine would you please be very specific as to what I need to acquire.

Budget wise, I don’t think I can get a “Kitchen Pass” for more than $2,500.

Any help would be appreciated.