Building a "digital" stereo to listen to Sonar mixes (and mp3s and spotify)?

My current stereo (amp, tuner, CD, tape deck, EQ) is from the 1990s.  We use it to listen to CDs (including my music), and I connected it to the TV (for decent sound during movies), and to the Playstation, sick Rock Band gets better latency when we bypass the TV and plug the PS3 directly into the stereo.
 
What the stereo lacks is any sort of "modern" digital playback.  There are no inputs free to attach an mp3 player, and even if I detached the TV or the tape deck, I don't really have an mp3 player that I would enjoy using every day.  Also, there is no computer near the stereo, so basically it's a dead-end in terms of being able to quickly listen to Sonar mixes on the "destination" sound system.
 
We will be moving to a house with 2 listening areas.  The downstairs will be for kids, TV, and playstation, so I am content to put the old stereo there.
 
However, for the upstairs "adult" area, I need a new stereo.  It's on that one that I would like to preview my Sonar mixes.  So, it needs to be able to play mp3s (or, ideally wavs).  It would be great if it could play most or all of my 500 GB CD collection, which I have ripped to wav files.  Also, it would be nice it could play Spotify.
 
I have a pair of powered monitors (Resolv 65a) sitting in a box.  I also have a pair of unpowered speakers which I could use as well.  And I have some old desktop computers collecting dust.
 
Here are the options I can think of, from cheapest to most expensive:
 
1) Connect old computer to powered speakers.  I don't have any spare monitors, so I'd need to buy one of those.
-- PRO: Easy to get Sonar mixes on it, since it's networked.
-- PRO: Easy to copy entire CD collection to it (assume its HD is big enough).
-- PRO: Easy to run Spotify (assuming the computer is not too old).
-- PRO: Computer could also be used for web browsing.
-- CON: Computers are ugly, and it might hurt the aesthetic of that upstairs room.
-- CON: Computer's audio card might not be that great (is a Soundblaster Live decent for home stereo use?)
-- CON: Computers eat power, and it's a pain to be turning them on and off just to listen to music.
-- CON: Have to remember to turn off powered speakers when done listening to music.
 
2) Buy mp3 player, connect it to powered speakers.
-- PRO: Smaller footprint (and power consumption) than computer.
-- CON: Might be harder to network for previewing Sonar mixes (in mp3 or wav format).
-- CON: Might not be able to hold entire CD collection (in uncompressed format).
-- CON: Might not support Spotify.
-- CON: Might not sound that great (compared to listening to a CD on the old stereo).
-- CON: Might have an annoying user interface (like every other cheap mp3 player I've owned).
-- CON: Have to remember to turn off powered speakers when done listening to music.
 
3) Buy mp3 player and amp, connect to unpowered speakers:
-- PRO: Don't have to remember to turn off powered speakers.
 
4) Buy "smart" TV, connect it to powered speakers.
-- PRO: We plan to eventually put a TV in that room anyway.
-- CON: Probably cannot hold entire CD collection.
-- CON: Probably has a slow, annoying user interface (like the other Smart TVs I've used).
-- CON: Have to remember to turn off powered speakers when done listening to music.
 
5) Buy "smart" TV and amp, connect to unpowered speakers.
-- PRO: Don't have to remember to turn off powered speakers.
 
 
What do you think?  What sort of "digital" stereo do you use to easily preview to your mixes (and listen to other music), in a "family" (non-studio) context?

I will add that for my wife in the kitchen/ dinning/ living room I bought a basic getto ( $80)  with the CD player and a USB port. It also has old school ipad dock which we've never used...my iPhone is a lightnig connector.  
It's a little JVC RD n1 from Radio Shack. I bought it because it sounded better than the rest I tried that day. 

 
It has a mini jack input and she sometimes plugs her laptop into it. Mostly she uses the Radio. 
My son gave me this weird ALtec Sub woofer with  8 Ohm speaker outs which I ran to some MIssion Speakers. It's weird as it only has a mini jack connector for input so must have been for a computer system..
I can use the headphone output of the Getto and fire up this killer system that's sitting in the front room.. I use the USB stick and load my studio songs on it to test it with the getto speakers or the "big"" system. 
But you got me thinking I bet I can network to my DAW with the BlueRay player... I'm going to go try that right now...

Ok the Blue Ray player only will access Netflicks and the app store. It has no browser or networking tools.
 
#1 the old computer-. I still use old XP computers and laptops and never run into any issues using the internet. I just installed a brand new wireless printer and it works.  And as far as using on board sound cards , it's only Sonar that hates their existence. I've been using on board sound for all my playback including my solo act live playback of backing tracks.. Most are very hi quality as far as that goes. Just don't use them with a DAW. I can even edit in Wave Lab with an on board card. 
 

"Grace" makes a lot of media players.  http://www.amazon.com/gp/product/B00HZN1WXE?keywords=internet%20radio%20grace&qid=1449576729&ref_=sr_1_3&sr=8-3
 
And most (Sony, etc) have mp3/cd player combinations that you can use with a stereo system.

As far as a computer-based system is concerned there are some tiny "home media" PCs about, and Apple's Mini. Very low power usage, very quiet and a base model would probably do the job easily apart from maybe needing an external USB drive to add more storage. If you've an ipad or android tablet then other than setting it up it wouldn't need a screen, MS and Apple have good remote desktop systems so the computer could be controlled from a tablet.

Been a long time since I heard a Soundblaster, but Apple's on-board sound is pretty good. Plus even the cheaper USB interfaces usually have adequate playback quality for a media setup. A base model Focusrite perhaps?

Have you thought about a raspberry pi?

You can set one up as a media centre complete with audio/video streaming.

Thanks for the pointer on not putting the powered monitors in the big upstairs room.
 
So, it sounds like I need to get an amp for upstairs.  This could get costly, especially since I live in New Zealand, and it's hard to ship a cheap[ish] amp here from the US.