I am about your age..... argh!
I agree with Matt about a NAS, network attached server. Anywho... you are asking many questions all balled into one. I can answer some of this by showing what I do..... but, a few questions.... do you still have a dedicated listening room with your chair in a sweet spot, or do you listen at a desk behind a monitor? How close do you want to be to the controls for volume song selection, source selection etc....? How important are old-school sources like a turntable and tuner?
I moved from my dedicated listening room into my office and sold off most of the big equipment I had... sold a pair of Magnepan 20.1!!! ooof that hurt. For that big traditional system, I had a dedicated Windows laptop connected to an outboard DAC in the equipment rack as another source that was equal to the tuner, turntable etc, going to a CJ Preamp. New school inserted into an old school system. I had to get up to do any program changes. The nice thing about a PC as a source, is that it can attach to the NAS and play your ripped library, or it can connect to any 'net streaming service.
Then I moved into my office.... my big desktop PC now is the primary source of control.... I purchased a Benchmark DAC1 that had a USB interface to the computer and a volume control.... I then fed the outs of the DAC directly to my big VTL Tube Amps..... In doing this, I maximized ease of use but eliminated my preamp and all the peripherals like my VPI turntable. All my programing is from two sources, my huge bit-for-bit ripped CD collection on my NAS, and any web streaming service. I have always used FOOBAR as my player software that will bypass any WIndows manipulation and passes pure, bit-for-bit, unmanipulated digital streams. Nice, but you won't hear the computer beeps and farts when this software runs. There are ways but it gets complex fast.... I have a set of cheapo logitek speakers plugged into the PC's soundcard and it passes the beeps and farts independent of the music bit stream.
I have since modded this desktop system.... I ditched the DAC1 and VTL Amps and purchased a PrimaLuna HP integrated amp.... kinda old school. Now I can hook up old fashioned sources. I pulled out my Accuphase CD player that has digital inputs so I can use his unit as a DAC or CD player, and hooked it to the computer using a MTEC interface device. What old is new.
I can answer more questions but you have to be a bit more specific. I will add that when you hook up a NAS to your home network, the music library becomes available to PCs all over your home. BTW, my highest priority was pure bit-for-bit transfers from CD, and pure transfer through the system to an outboard DAC...... I will accept no sound degradation of source material.
Peace
Bruce in Philly