AC Power cords, which components 1st...?


I've been lying in the background with regard to upgrading power cords and I'm now thinking that I might give it a try. I fully subscribe to the laws of diminishing returns with the exponential (if not worse) price curves of these products. Therefore, I'd be looking in the $50 - $250 dollar price range. I don't need long cables (3 - 4 ft should work) and that may help the price point. Pre-owned is fine with me as well.
Given that, which components first? power amps, pre-amp, source...? and, any thought on power cord given my predisposition?
Aloia power amps, Casanova pre/pro. Capitole MKII (soon, I hope).
Thanks
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I disagree with Brtritch. One need not have a class A system in order to appreciate the addition of a top flight pc. Of course, placing a $1000 cable on a $500 component doesn't make much sense either. Having said that, I have heard expensive pc's make profound improvements in modest systems.

My recommendation would be to go to a service oriented dealer and audition some pc's. Try the cables on a couple different components. Then decide if the pricier cables seem to be worth it. Keep in mind that pc are very component dependent. Next, borrow the pc's for an in-home audition. My personal experience suggests starting with the amplifier first but as long as you have the cables at home, try them on different components. Also, keep in mind that high capacitance pc's can cause problems in a system. I've had some that created power supply transformer hum and system noise that was audible from the listening position.

For what it's worth, the $340 Shunyata Sidewinder Gold pc on my monoblocks made the single biggest improvement in my $30,000 of any upgrade I've made in the last couple of years.
To answer one of questions about where do you first put a powercord on the Dac or Transport in the majority of systems the transport has a much larger effect than the Dac.
But as with everything in Audio there is no absolute. We have found a few rare cases where the Dac has a larger effect.

A powercord greatly improves the effects of a line conditioner.

Shunyata Research has just come out with the best Audiophile powercord that I have ever heard under $200 the Diamond Back at a retail price of $150. Having said that let me also state that I am a Shunyata dealer. But I have just finished listening to them for over a week and they are very good. Better than I expected them to be at the price point.

Also, do not be surprised, as have so many Audiophiles' before you, that once you experience the effects of upgraded powercords in your system that suddenly your budget will rise.

Good luck you are in for a surprising experience.
PS.....I say to start with the AC conditioner/regenerator, etc, if there is one, not so much for cleaning up the power, but to be sure your system is getting enough current. Anyway, the conditioner/regenerator will not have to work as hard if it has a good cord connecting it to the wall.
Check out the cables from Virtual Dynamics on Audiogon. $75 for a 6ft cryoed p/c. Just purchased one for myself and it's incredible. Spoke to Rick at VD and he said they are having a big sale to get some product recognition.
I would buy one and experiment. My experience has proven that it's not possible to predict the benifit to a single component within the system. I know from personal history the BMI Whale is a good fit for the Aloia, and I know the power snakes are very strong with the Casanova. Try the new Python, it is a very good cord. I use all NBS Statement but they will push your budget even used.