IIRC, I think Peter said that he liked K100s in the front-loaded cabs and V30s in the rear-loaded cabs. I don't exactly recall him saying which was his favorite with the Herbert, but I vaguely remember something about the 412FK.
FWIW, I picked up a 412FK to go with my Herbert. To me, the 412FK sounds better with Herbert than any of my V30 cabs, or any of my other cabs, for that matter, regardless of speaker. Although... it did get along really well with several 65w Creamback loaded cabs (2x12 & 4x12). Years ago, my main cab had K85s (same speaker as K100), so I kind of knew what to expect from those. Just for the record, I'm usually not a big fan of V30s with most amps (but not all).
Just my opinion, FWIW, but I'd go with the 412FK, but I doubt you'd go wrong with the 412FV or even the 412RV for a slightly looser feel.