Which speaker cable?

Audioquest sterling- if you can afford it. Nothing compares

The cheap and good working solution:
Go to home depot and get a roll of 100 ft 16 AWG sold core copper ( $8.20 ) and make twisted pair for each + and -.
This will give you 13 AWG and it will be much cleaner and tighter sound than the monster cable.

Phild is correct about cabling and system synergy. My entire system is cabled with Acoustic Zen, however I switch back and forth between AZ Hologram II and Audience AU24 depending on my mood.

I slightly prefer the AU24 for its more pronounced and lively midrange, while the Hologram II has better extension at both frequency extremes and a slightly more balanced nature.

It sounds like the Acoustic Zen might be more to your liking, so you might consider the more affordable Epoch series of Acoustic Zen speaker cables.

Good luck!

I have the same amp and speaker setup as you (check out my system), and chose to use AudioQuest GR-8 cables (mostly because I needed cables for the long runs to the rear speakers, and wanted to use the same cable throughout my system). There are better cables out there, but for the money, the GR-8 cables are hard to beat.

One thing I've come to realize lately is that power (electrical) and speaker placement greatly affect the sound of my system. Moving my speakers 6-inches back towards the wall and running my RMB-1095 through a Furman power conditioner made a significant difference.

Check out signalcable.com- look at the audiogon feedback and particularly the positive-feedback review as my experience with their speaker cable parallels the reviewer's.