Favorite cable brand.

XFinity?TeeHee

For my system the winner of the speaker cable sweepstakes of 9 contestants was Straightwire Maestro. Interconnects became Straightwire Maestro after 7 shoot outs until I tried Straightwire Virtuoso. SACD and DAC feed the pre-amp via Straightwire Virtuoso and the pre-amp to amplifiers are Maestro. Streamer to DAC is Canare Digital. Power side is Audioquest Niagara 3000 and all noise drain Audioquest power cords.

Kimber is excellent at whatever level you can afford. 

+1 for Morrow.  I use MA5 for both speakers and interconnects and in my system, sounds perfect.  I prefer them over Cardas Golden Cross for speaker wire and MIT 3.3 shotguns.  They just have a detailed yet mellow sound to my ears.

If you choose only one brand, then Synergistic Researh. There are no other options for me.