Given your goals and short of making your own cords, which you should seriously consider, I think your best bang for the buck will be Cullen cables. On paper it looks like the Red Copper cable is a great value at $99/6ft, but if you can swing it there’s a lot more built into their Crossover cable at $199/6ft. These two cables seem to be more neutrally voiced, but if you’re looking for a little more warmth in your system the Gold series cable is $129/6ft. Cullen cables get great customer feedback and the prices are tough to beat. Hard to imagine you not getting a significant benefit from switching stock cords to these.
As a a dark horse option, I recently heard of Raven Audio that also seems to make high-value cables. Their Soniquil power cable is $169/6ft. and comes with Rhodium-plated connectors that you’d need to step up to the $199 Cullen Crossover to get. There’s obviously a lot more to it than the plugs, but to me it indicates good value and may also be worth a try as you never know which cable will synergize with your system and tastes. And both offer trial periods, so you can try both with little/no risk. That’s what I’d do. Anyway, hope this helps, and best of luck.
