UGGH BALLS!!!!!
The Nailbomb set is pretty cool. They are raunchy though.
My favourite BKP set right now is the Juggernaut Set. I have them in my 6 string superstrat (Godin Redline III) and they tear. They're tight and responsive for rhythm, they hammer in the low mids, have a perfect feel for lead / soloing, and sound great clean pretty much overall. They also sound great across the range of the fingerboard, low right to high.
I don't do AT ALL what Periphery does and I find they're really quite suitable for a beefy modern tone, for whatever sort of metal, prog rock, or hard rock one wants to do. They'll handle low gain / edge of breakup but it's a distinct voice and may or may not work with what one is doing.