I need advice for power cords

In my system there are 4 components that power cords are interchangeable.  They are PrimaLuna EVO 100 Tube Preamplifier, PrimaLuna EVO 100 Tube DAC, Manley Chinook phonostage and Dayton Audio sa1000 subwoofer amplifier.   Should they all be upgraded, if not all which one to change to give me the most improvements.  I can't go crazy on cost, 1k to spend.   I've followed along with many threads on this subject. Always looking to make improvements to sound quality.   Many of you have much more experience with cables than I do so what do you recommend and I can do the research.  On a side note my McIntosh MC75's are vintage so old thin manufacturer cables and probably shouldn't change them. 

Hey,  bac2vinyl, I'll bet ya my system sounds better than your cheap cabled set-up.  Just-sayin!
The best $1000 I spent on power was purchasing a Core Power Technologies Equi=Core 1800. Made a huge difference in the clarity and dynamics of my system. More so than any of my many cable changes. Just my experience.
Question, why would someone buy an expensive power conditioner for a power cord that’s probably not in the correct direction, directionality wise? What are the odds? Gotta be two to one. The more you know the cheaper you fly.
 i got this far then tossed everything down and said F. it .  Someone said,,,
 Skip the sub. I would also skip the DAC because there is sadly no way of making digital sound good so why bother?   Vodka drinker