Power - where to start? Mains, chords, conditioner, filter?


I have a decent HiFi setup with all power cables as delivered by the manufacturer of the unit. I am contemplating upgrading the power infrastructure, but is a confused where to start? What makes the biggest bang for the buck? Power chords to each unit, mains blocks, mains conditioner, mains filter? Any advice before I move into this world? 

I have a streamer from Innuos being used for Tidal and Internet radio. A DAC from RME and an integration amplifier from Musical Fidelity. 

I live in a flat in a capital and the electricity is probably good, but for sure the SQ is better late evenings, which to some extent is leading me down this route. 
mtraesbo
I recommend running a fresh dedicated 20 amp line from your main circuit box to the location of your system. Use Hubble hospital duplex devices. Use of power conditioner is optional as needed.
I also live in an apartment and greatly lowered my AC noise floor by powering all my gear from a balanced AC power supply from Equitech, the industry leader .
 Modifying the wiring and plugs in my place were not options without risking eviction .I did later make my own power cords using Oyaide's Black Mamba cables and gold plated copper plugs and iec connectors to great benefit .

A side benefit was that the colors on my television also became richer , with blacker blacks . YMMV
In my opinion, the place to begin is with one or better yet two dedicated circuits with 20 amp breakers and wire runs of 10 gauge although 12 gauge would work. In addition to that use high-quality AC outlets.

Agree completely and that's exactly what I did when I set up my current main system (I located the system in the next room to the main panel).

I use a filter (Inouye - http://inouye.ca/index.php?page=Products) on all front end source equipment (sources, phono preamp, preamp), which makes an obvious improvement, but not on the power amps, which suck too much to go through most power conditioners.
I've done the dedicated circuit,  regenerator,  and selective power cords. The P15 made the biggest,  monumental changes actually, improvement. Dedicated circuit couldn't hear the diff, but then I'm running through a regenerator. Power cord between the wall and regenerator was the most significant PC upgrade, dac next.
Regenerator helps a lot in my case, I have older PS Audio PPP, but it is not enough when wall current is very bad. Possibly their newer units are significantly better. But again, there is no substitute for great equipment. Power cord on regenerator is very important, I can confirm.