Hi,
Just thought I'd add a comment to this chat.
I have had an Arcam A75+ integrated amplifier paired to a Arcam CD72, with a set of B & W DM602 S2's and have had years of wonderful listening. The arcam delivers such a warm and detailed sound that the B & W's manage to handle with finess well above their relatively modest price tag.
In terms of speaker wire, all those suggested above are fine choices. If you go with one of the well known companies such as Chord, then you will be fine. And, as long as you have decent equipment which you do, it really is the case that the more you pay, the better the sound will be.
In terms of Bi-amping I would have argued that you probably don't need it a few years ago. However, my friend has Cyrus series 6 integrated and power amp combo and we bi-amped the 602's through it. I was absolutely shocked. They sounded like completely new speakers. The B & W's sounded like they should cost twice their original price. Unforunately, being a PhD student for past 4 years (finally finished!), I have not had the finances to upgrade, but will definately be looking to Bi-amping my 602's or even investing a new set of 684's.