PM John Rutan at audioconnection. He'll give you the best advice. And, it is free.
Unless you want to make your own from Dueland 12ga which is simple, Signal Cable is a good sounding reasonably priced cable with Vandersteen. I used them with 2CE Sigs and Treo's.
Agree with using Audioquest. I had MIT networked cables in my system, but when I got the Vandersteen's, these were the absolute poorest cables I could have used with them. As far as the up front sound of vocals you are experiencing with your Vandy's, make sure you have the tilt back of the speakers set correctly. When you determine the correct angle, make sure both speakers are at that same angle. It is critical.
Richard Vandersteen and Garth Powell will be attending the LA/OC
Audiophile Society September 29. Garth will be discussing his new
line of speaker cables that up to now have only been rumor. The new
line is called Mythical Creatures. I'm not sure if there will be a demo, but
it would not surprise me if there was one. A short while ago Garth
attended another meeting of the Society at the same dealership, Sonny's
Componets in Anaheim, California. At that meeting we heard all about
the fantastic new Storm Series of power cables from Audioquest. Now
we will see Garth and hopefully hear the much talked about new speaker cables from Audioquest. If they are anything like the Storm Series Hurricane power cables that I purchased, these speaker cables will be very special.
So they changed the jacket on the Hurricane from red to dark blue so that the Firebird can use red throughout it's range from cord to cables. The Hurricane hasn't changed at all and this is directly from AQ.
Teh Firebird is going to be special based on what I was told by someone who heard it in a system he knew well. Really looking forward as these will be game changers and make others think about what they are doing and how. he has measurements to go along with it all as he always does. Hey, it's Garth, so it can be measured.