to bi-wire or not?

+1 gdnrbob  

To OP, does Joseph Audio recommend biwiring?  As gdnrbob said above, get loaners from your dealer and check it out for yourself.

Vandersteen crossover designs are optimized for true biwiring and I have, in 30 years of Vandersteen's, never run them any other way.

@kalali  Not if you use two separate runs of cable, one from the amp to the bass speaker input jacks and the other from the amp to the mid/treble speaker input jacks.  Some refer to this as "True Biwiring".

Cool experience @nonoise. If you have the opportunity, try running cables of identical topography to your speakers or even better, identical pairs of cables to your speakers. IMHO the best deal in speaker cables right now is Wireworld. I got two 8 foot pairs of Equinox 8 cables made of the purest copper currently available for a mere $1400.00. In the 3 and a half years I’ve had my speakers I have the most spacious, detailed and musical sound ever. I consider that a deal at the price. Good luck with your system. 
Enjoy the music.  

@nonoise  If you are looking at Audioquest cables go for the PSC+ conductors if possible.  I used to biwire with Volcanos on the mid-treble and Calderas on the bass.  The Volcanos were all PSC+, the Calderas were PSC. When switching them and putting the Calderas on the mid-treble, the music acquired an “edge” that wasn’t there before. I tried this at a friend’s with different speakers and components and we both heard the same thing. When switching back, the music returned to its previous beauty. 
The good news is that MusicDirect has PSC+ Audioquest speaker cables on sale for half the original retail cost!  If you haven’t already done so I would urge you to check their Clearance cables out. Purer conductors= purer music.
Enjoy the music!