I'm talking electrics here - not 8 strings, not 7 strings, but 6 strings for normal folks wanting a tighter tone from the bottom end. I've been intrigued of late, and want to experiment without killing my piggy bank.
I think a Strandberg Boden OS 6 might be your best bet. The only problem I have with Strandberg 6s is that the neutral fret is the zero fret, so it actually feels like a more extreme fan as you go higher up the neck, as opposed to the 7s, which have their neutral fret at the 7th, and then fans in each direction. (I also think their EndurNeck profile feels better as a 7, just because it's wider and feels more natural to me.)