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
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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. 
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