I've spent a lot of time on the phone with Doug and Tim recently, and I can tell you Doug pretty much swears by three BKs - the Nailbomb, Warpig and Miracle Man, in all variations and combinations. Basically, this equates to Nailbomb for clarity, Warpig for brutality, and Miracle Man for more smooth scooped sound.
Since Idigbo, the wood the B6 is made out of, is very midrangey, a Painkiller wouldn't be a great choice. Doug had just received a Holy Diver, and was singing its praises, though he stressed that he has barely had a chance to try it out.
If anyone is interested, in the time since I last posted in this thread, I changed my order to a B2, which will be with me in just under a month ( :D ). The guitar will have a chambered mahogany body with a 100yr old private reserve grade quilt maple top (a good 10mm thick!). Doug sent me pics of the body today, and it is simply stunning.
With Tim and Doug's guidance, I've gone for Painkillers, as they are extremely clear and tight, with an awesome midrange heft. Tim's description of the neck PK, which is the only BK neck pickup to use a ceramic magnet, sounded like exactly what I wanted - ridiculously clean and clear, very fluid and stupid amounts of sustain. I'm incredibly excited to hear it!