Need suggestions for streaming files to my stereo

Thanks to all of you I now have a grasp of how the system works. Now that I understand it better, I thought of a few options. Please let me know what sounds best (or if it's even viable). 

1. Use a 7 year old Dell laptop that I forgot we had. Works fine but so may want to upgrade the wireless and Bluetooth. Drawback is if I leave it running for extended periods, it heats up and the fan engages every few minutes. 

2. Use a tablet connected to an external HDD that holds the music files?

3. Stick with the Raspberry option. 

Simplify your life, shorten your signal path, and improve your SQ. Keep all your music on a Mac mini, plug a decent DAC into it's usb, then plug the DAC into your amp. Done. Control it with your iPhone using the Remote App and/or your laptop with Screen Sharing. 

It has been mentioned here that many of the responses to the OP have not paid attention to the budget of $200. I, myself, admit to this error. But one must include the hardware cost of a computer. Like many of the newer (changing) technology with hardware associated with streaming digital it seems a more budget friendly option to just adopt newer software or even low cost hardware that attaches to a computer. The computer, itself, is a device that has limited life as a streaming device. HDD space, RAM and processor power, as well as software compatibility will become an issue.
I had wanted a separate device to stream my music. I want to keep ITunes and a computer out of the loop. Therefore, that is the reason I opted to go further with my budget to get a Bluesound Node 2.
At one time, I wanted to use an older MacBook Pro as an integral part of my audio playback, but alas it is too old and slow for this purpose.

Autre with your options I would ask myself which of these options would match your overall plans for a music playback system.

Subscribe to Tidal and Roon - both have a free trial so nothing to lose. Roon can be used to control everything (files on your PC as well as a Tidal) with Roon’s Amazing interface (use an android or iOS device to control and browse music) and with excellent artists info from All Music database. Roon handles every format I can think of and Roon can play bit perfect to your DAC and is clever enough to convert anything that your DAC can’t handle to PCM at a suitable sample rate.

I am so impressed by Roon’s interface - really high quality and definitely geared at audiophiles who want to control quality to the Nth degree. Downside is $100 or so annual subscription but from what I can tell you could be up and running with no hardware purchases....