Choosing new cables

All three levels of Cerious cables are great for the price...though the Lumniscate are worth the price and your stated budget will work...and they are manufacturer direct with 30 day home trial...

Just because your cables are 10 - 15 years old and your happy with them doesn’t mean you should change them.  I wouldn’t change them on age alone. There’s no reason. 

@bobheinatz I have the Boulder 866 in a simple system with the Project RS2 CD Box transport and Joseph Perspective2s.  I just initiated a cable upgrade with a similar budget. I have tried a number of different power cables with the 866, including an older Elrod (my favorite with my previous amp), Core Power Diamond Extreme (a relative bargain), Audio Envy Whale, and a few others.  Two weeks ago, I ordered a Hijiri Takumi power cable.  It is still settling in, but was a substantial improvement from the get go (which, given the price, was a relief).  My investment in the Takumi followed a review of the various threads, talking with Colin, and also a back and forth with another Audiogon member who had tried the Takumi on his 866, with great effect (as he told me, "Believe me, there was a big part of me that kind of hoped it would just be another overhyped cord, but its impact was just undeniable."  I concur).  

For speaker cables, I have been using the Silversmith Fidelium.  I love them, especially at the price, but they may be a bit light on the bottom end.  I am currently in the market for an upgrade.  I just started an audition of a set of Argentpur cables made by Ernie Meunier (https://argentpur.audio).  I think they may be what I'm looking for, but I haven't had time to assess them yet.  Another cable I was looking at is the Inakustic 4004.

I use an AES/EBU from the Project to the DAC in the 866.  I don't know if you need a digital cable.  If so, I've had great experiences with both the Hijiri Million, and also Bob Grost's Cerious Lumnsicate cable. 

I hope this helps.  Good luck in the search!

I like the way you guys think...but...i would do speaker cables after upstream is a done deal...sc are only as good as what fed.

1.) Good power cables/conditioning.dedicated if possible.

2.) Ic’s that are keeper’s

3.) speaker cables to me are cherry on T😁