How about Strapping Young Lad? Both Dev and Jed were using Recto's; I guitar-teched for them on Ozzfest 2006 and believe that they had one of the most truly monstrous sounds (guitar, and as a band) that has ever been in the world of metal. On top of that, Devin is one of my favorite vocalists of all time; his voice is frighteningly diverse, running the full gamut from all manner of screaming vocals to some of the best singing technique I've heard. Check out Alien and The New Black (their last two records, and my personal favorites.)