If I had to choose one, it would probably be Necrophagist vocalist/guitarist, Muhammed Suicemez's 6-string Xiphos. He also has a 7-string version that's also pretty cool.
I also love Dino's entire LACS collection...same goes for Meshuggah...and that Jack Bowen is pretty nice.
Aw Hell...I think most LACS guitars are awesome.
There is one that I haven't seen enough of and that's Tom G. Warrior's Iceman LACS. Out of all of the live videos out there I've only seen him use it once (Wacken 11'). I'd like to think he'll use it again, but if not then I'd be more than happy to take it off of his hands (fat chance).