Thr1961,
I agree on the upgrade path, the best improvements I found were with power cables, then speaker cables, then interconnects. I am testing several power cords righrt now, so I can't yet give you a final recommendation...but the Morrow Audio MAP4 and Zafino Majestic are the leaders in the clubhouse.
I have found GREAT success with Morrow Audio analog interconnects (RCA and XLR) nterconnects, and digital 75 Ohm RCA. They punch way above their cost, and right now they have a 40% sale. These are amazing value for the sound quality I've found
USB cables are Supra Excalibur, and ethernet is Audioquest Vodka cables
Suggestions: Start with the MA4 or DIG4 level and go up from there, and absolutely get the cable burn in service....the 20 day break in service is $99, and is a one time charge that covers all cables purchased...not per cable. They have a 60 day return policy, but only after 30 days; meaning you need to try them for 30 days before returning the cables.
Currently "rolling" the Zafino Fusion and Arcadia interconnects, great value but not sure if there is an improvement over the Morrow cables.
Speaker cables are currently Anti-Cables Flex 4.2 cables, but am testing the GR-Research 24 strand speaker cables as well. They are meant as DIY, but Danny will assemble them for an additional fee.
As you can see all of my recommendations are cables that are affordable, but provide great SQ.....great bang for the buck