Single vs Double Bi-wire....should I reconsider?

IMHO, I would definitely reconsider. Anything you read from Vandersteen is very direct about using a true bi-wire. FWIW, I have read threads in this forum from Vandersteen owners that said, a true bi-wire cable will sound better than a somewhat more expensive single cable with split connectors.
 

Well...If you look at the cable geometry, the Rocket 44 is pretty similar to a double bi-wire type 4. The Rocket 44 is basically 2 parallel star-quad runs in a single sheath. This is why the Rocket 44 cable is a good single bi-wire candidate. However, the Rocket 44 is constructed with better materials than the type 4, hence Richards recommendation (probably). A single bi-wire Rocket 44 should be a step up from what you have. 

Thanks all. I decided to go with the true double bi-wire.

Smaller error in kjweisner link - missing colon, updated.
http://vandersteen.com/media/files/Reprints/vandersteeninterview.pdf
Als0 - there is A LOT of information in that link besides bi-wiring.

Thanks.

Next up, Richard says the cables need to be separated by at least 1"-2".   Does anyone have a suggestion for cable separators?  Where to get them.  I guess I need something that isn't metal, and won't collect static electricity.

Good move on getting double run.  I've been listening to Vandersteen as my primary speaker for over 25 years now going from 2ci's to 2ce Sig to original Quatro and now Quatro CT, and obviously quite happy.  Recall I started off with double run AQ Type 4 and went up to AQ Slate double run.  Now running Cardas cables -- the larger Cardas blocks have "V" channels separators that work well to provide some distance in routing cables as well as serving notice to guests not to step on the wires!  Make sure your speaker spade termination is spec'd to Vandersteen sizing.