What cable companies make the best cables and sell them directly?

Agreed with the vote for Signal Cable. 

Hi,

Without any doubt Triode Wire Labs cables. The lesson I've learnt after buying them is that people in most cases don't need a new amplifiers or new speakers, just a good power cord or good cables.

For the Dac the "Digital American" is highly praised, I'll get one soon.

At the moment I own "American cable" which is for speakers. It totally changed the dynamic adding a lot of energy, engagement and a very meaty sound.

Then I bought the interconnects and power cord "Seven Plus" for the amp and it outperformed anything I tried before. The bass is totally different, more defined, natural and deep. It felt like I bought a new amplifier indeed!

Plus Pete is a joy to deal with:)

There is no such thing as best cable, each one sounds a bit different  do to its design build all depends what your looking formy warmth depth ,detail ?

andbiggest factor what is your budget in todays world $5 k for speaker cables 

is not even close to most expensive . Myself feel for under $2k you should’ve able 

to get a 2 m pair     I Find the Wireworld Eclipse give very good value ,

Might give these guys a shout:

I've had good luck with Morrow.  Replaced Purist Audio Design speaker cables with their SP4's (better sound and markedly more flexible for routing purposes); recently added a 26' interconnect to put my headphone amp back in the main system for daily use.  Not cheap, but relatively affordable with their frequent discounts.