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. 

Thanks 
Mike 
zardozmike
Skip the sub amp. It will make a difference however slight compared to everything else. When you have a budget you make budgetary decisions and this is the first one- skip the sub.

Next after the sub amp, I don't know where people get this idea they need a power cord for this and a power cord for that. If the power cord is good it will improve everything, even the sub amp just not as noticeable. But listen, its not that it doesn't make just as much difference on the sub amp. Sorry, know that sounds confusing but bear with me. It makes little difference on the sub amp because the sub amp operates in only one very small part of the audio spectrum, and a part we are not good at discerning fine detail at that. 

Everything else though works all across the whole spectrum, including midrange and treble where our ability to hear and discern fine detail is exceptional. So do yourself a favor. Forget everything about a power cord for this, power cord for that. Focus on finding the best two power cords you can for your phono stage and pre amp. Skip the sub. I would also skip the DAC because there is sadly no way of making digital sound good so why bother? But that's a judgment call, not everyone has figured this out yet, its your money, your system, and so if you want to divide your $1k into 3 then go for it.

Anyway, that's the deal. Forget about components, concentrate on the best 2 or 3 power cords for the money. If you go with 3 then it becomes super easy, just search around and buy 3 used Synergistic Master Couplers. That will be right about $1k, if that. If along the way you find a $500 SR Blue or something like that, go for it. Put it on the pre or phono. Whatever. Just do yourself a favor and focus on Synergistic. 
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Johnny Rutan believes the source should get the best cable first.
So, my DAC got an AQ Thunder power cord.
He was right, as usual.
Bob
In my experience the cable design will predict where placement is best.  Some is the source, others are the amp.  One improvement for me was Torus Power isolation transformer.  Modern power have a high degree of pollution from electronics even when you run dedicated lines.  This was my personal issue.  

Buying cable used is a great value.  I like Allnic ZL, Audience, Zen Wave.

I prefer Copper over Silver.  But this is entirely subjective.
I am focusing on playing vinyl mostly, streaming when I'm to lazy to put on an lp.  So I will look for the best cable I can find for my phonostage, the the line stage and probably not worry about the dac or subwoofer amp.  SR will be at the top of my list.  I don't own right now, ex got the house,  but will be buying in a year maybe sooner.  Then I will look into dedicated lines.