(1) the speaker<->room relationship will be 90% of your performance. so not just the speaker choice, and not just the right room, but the best speakers you can afford purchased to have the right type energy and frequency extension for your room. and then set up properly in that room. if you just get this part right, you can count on pretty good sound no matter what else you do.
(2) next; get an amp that is synergistic with the speakers and results in a presentation that you like. success here and on #1 and any cheap cd player with a volume control will sound nice.
no amount of messing around with other stuff will overcome mistakes with the speakers, room and amps. period. that's the deal. speakers are where most of your dollars should go.
(3) what type media do you prefer? get the best source you can buy and go direct to the amps.
(4) power grid noise? ambient noise? too broad a subject to boil it down too far, but these things need to be dealt with as best as possible. next is basic acoustics. simple common sense stuff. first reflections, listening position. near field or far field? how many people will be listening and how loud will it be? if it's a living room what are the limitations? you have to balance all of these things.
(5) what easy changes will yield the most ROI? again, a very broad subject. maybe a dedicated line might be a big deal, or some acoustic panels?
(6) cables? racks? simple DIY tweaks?
(7) a preamp? a better amp? a power conditioner? network tweaks?
that's how i would approach system building from scratch. right speaker for the room, and then the right amp, and go from there.
If I am interpreting what you wrote correctly, you are saying:
- Spend 90% of your money on Speakers + Room, and
- 10% - on everything else
And you are putting cables and power and network stuff at the last two items on that list!
That goes against the dogma that has been promoted in audiophile circles for decades. :congrats: