recommended speaker cables and interconnects

Not a sensible question OP.

Most people accept that interconnect and speaker cable changes can have effects on the sound.  These effects arise mainly because of the interaction of the cables with the active components they are connecting rather than by the attributes of the cables themselves.

Further, each of us favours a different kind of sound.

So it is useless and damaging to take recommendations as to which are the 'best' cables for every system and every listener.  You are very likely to be disappointed.

The only way forward is to listen to a lot of different cables in your system and choose the ones that sound best to you.

A dealer or widely experienced audiophile can help by using experience of different cables in different systems to narrow down your choice by eliminating combinations he knows are unlikely to be synergistic.

I have had numerous interconnects and speaker cables over the years and I absolutely love Audio-Envy !  Cap the owner is very easy to work with, and yes they do have a return guarantee, although I've never had to send anything back.  They are very reasonably priced and are very high performing.  Their cables have low capacitance which doesn't attenuate the upper frequencies.  I have turned several of my audiophile friends from their expensive interconnects and speaker cables to these.  Highly recommended !  And yes...  I believe you can return them if you don't like them.  Just call and speak  with Cap...  

..Silversmith Fidelium speaker cables..a giant killer 

I find the Giant Killer comment so funny.

Silversmith Fidelium speaker cables..a giant killer 

You didnt mention Digital cables but I just compared a $440 Kimber D60 to a $45 Mogami 2964 and the Mogami is amazing for ten percent of the Kimber price. Available on Amazon so 30 day return.