If Mac is tubes (cause they also make some decent Solid State stuff . . they're tubes sound better though ) I will recommend a look into a manufacturer called PSC (Pure Silver Connection) out of Aussieland they have a distributor in US I think in California.
Their cables are out of this world in terms of fluidity, accuracy, musicality, the there factor and the jump (dynamics)factor are all there, they sound absolutely natural but also incredible fast and detailed, kind of like the best Kimber silver stuff but with more speed and air.
Their R-70 and R100 for speakers and Custom for interconnects are simply AMAZING not cheap but worth every penny and then some . . look into them as with everything is a flavor/taste thing.
If you use Solid State try the Kimber Select silver cables expensive but close to perfect as you can get solid state to sound. . .
I had in my system Siltechs, Shunyatas, MIT, Kimbers, NBS, Nordost, Transparents, VDH, can can tell you with confidence that the best ones are PSC silver and Kimber Select Silver series. some of the others are pretty decent but not in the same league, not even the super expensive NBS, pretty decent just not worth all the hype.
Both Ray Kimber and Mark Mozgawa arrive to that final sound trough different avenues both using silver but different geometries and conductor shapes. simply amazing.
One of my systems (all tubed even tubed DAC) uses PSC cables (even the power cords silver) the other systems use Kimber, Nordost, Monster, other silver ribbons and others home brewed, nice stuff.
Enjoy the music! have fun!
G.