Podeschi, I don't own a VAC preamp, just a VAC amp (the Phi 200). I agree with most reviewers that the VAC Phi 200, even though fully balanced, sounds better with single-ended than balanced interconnects. I have done some extensive auditioning of cables and can recommend Crimson Music Links cables. At $320 for a 1 meter pair, they are a real find, better than anything else I tried, which included cables that cost up to $1100. The US distributor in Austin allows an extended demo of the cables. WyWires were also quite good for the money, especially if you want subterranean and very textured bass, but the Crimsons edged them out in my setup for overall openness.
If money is no object, I would give Tara Labs' high-end cables a try, although they cost almost as much as VAC components.
If money is no object, I would give Tara Labs' high-end cables a try, although they cost almost as much as VAC components.