If you are into DIY, a single run of the Stan Warren quad cable will work great. Using the quad 12 AWG recipe, you end up with a cable that is about 10 AWG which is plenty big. I have about a 20 foot run of this for my New Original and it works fantastic.
If you are doing bridged mono then there is really not a lot of reason to bi-wire. If you are not bridging the amp (i.e, just doing a mono input via a Y cable with dual outputs), than dual runs of a smaller AWG (12-14 AWG) should also work OK.
Julian
www.sedonaskysound.com