Which Audio Interconnect would you recommend?

Coachp,

I think that you are barking up the wrong tree!
You need an interconnect for a subwoofer? The sub will be responding to deep bass from 20Hz-120Hz at the max. Probably you have it x-over lower than 120Hz. What, in the world, are you doing deciding among: Kimber Kable Silver Steak; Silver Audio Silver Bullet 4.0; Pure Silver Sound Quartet; and Home Grown Audio Silver Lace??
You are using less than 1% of the audio spectrum! The cables you are considering are full-range cables whose properties you will not even begin to use!
Both Psychicanimal & Sean give good advice. Get Canare, Acoustic Research or Monster Cable. These cables will get the signal to your sub w/ minimal loss.
Pay a lot of attention to providing clean AC power to your sub, placement of your sub for best integration & isolation of the sub from the floor.
IMHO. YMMV. FWIW.

Thanks for pointing that out Sean! Looks like I read Coachp's original post rather quickly & missed the point about his wanting interconnects for both situations.
Sorry about the rather emphatic post, Coachp!

Coachp, if you are willing to take some advice from me still, I'd recommend that you stay away from Kimber's Silver Streak. I own the Hero & its pretty useless a cable! I've heard the Silver Streak (during my auditions to buy interconnects) & it was harsh on the ears. It has a very high "wow" factor since it yields a very detailed sound. However, upon extended listening I found that it was distortion I was listening to & mistaking it for details. The sound is brittle & un-natural. I personally felt that until I went up to the KCAG & higher in Kimber's line-up, I wasn't going to get an honest (music-wise) cable. IMHO. FWIW.

Just looking @ your components (which are all on the bright side), your decision to go to silver interconnects might be unwise. The silver will be rather transparent & will reveal every flaw in your components + create a lot of listening fatigue. I feel that you will be much better off getting pure copper cables.
One superb copper cable that comes to mind is Discovery Essence (obtainable factory direct). This one seems to be have just the right mix of warmth & details. Another that comes to mind is Van den Hul The First Ultimate. Yet another suggestion is the TARA Labs Prism 5500i.
For the subwoofer, I still like Psychicanimal's advice to you.
IMHO. FWIW.

Coachp,
No experience w/ QED but I do own the DH Labs BL1 Series II interconnect. For the $99 or less paid for it, it's a very good cable. It is silver-clad copper cable i.e. the core is copper with a silver coating. The Kimber Silver Streak is a little diff: signal wire = silver & return wire = copper. From whatever I know, Silver Audio Silver Bullet is a pure silver cable i.e. no copper in there.
My experience with DH Labs has been very good. Maybe others can chime in here re. their experiences w/ this cable.

For the money, people have also found great success in:
Signal Cable
Luminous Audio Technology

FWIW. YMMV.