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
I have a question/request.....those with extreme voodoo opinions/statements re power cords, fuses, cables, only @ full moon hi rez uploads, wooden blocks under cables (not env.friendly, you know that?), etc etc....so, pls tell me that in your professional lives you do not fly commercial planes, do not perform medical surgeries, you are not neuro surgeons, operators of NORAD stations, financial advisers (actually, I pass this one...), school bus drivers, operators of heavy eq., nuclear plant operators...etc etc...pls say - you are not...otherwise our society is in a great risk of a total collapse...
Thank you
Well kozka, you have made 4 posts in 9 days in your AudiogoN career. I am curious, when do the creative, thoughtful and insightful ones appear?
I gather you just read them...

want some some more:
always use:
'fast power cables'
'speaker cables that PRODUCE warm sound'
'fuses that substantially increase 3d imaging'....and so on and so on..

I came here to find out about Fyne F703 speakers...thinking that maybe on this forum someone had them...and then of course I discovered, as on many other forums, a niche of users that got me worried as per above message...and for you this is not a thoughtful statement? 
I recently picked up a pair of Synthetic Research master coupler power cables from AudiogoN.  I will be using them on my preamplifier and phonostage, my analog setup is the most used.  Will update when I get them and have had a chance to listen with them installed.