Brad Shoemakerdeep perhaps, though his ability to go into high pitches means his voice isn't quite that deep; personally apart from shrill laughter I'm completely unable to go into anything of a middling range; I suppose when I yell I barely cross the threshold of baritone.
@andrewb: I see your Baldur's Gate and raise you Baldur's Gate: http://www.youtube.com/watch?v=EN8xFUPirec
http://www.youtube.com/watch?v=IJpZaip2QjQ < Only video with any sort of quality to it; despite the myriad other issues. Thralldeep, Hellscreamdeep, and Mannorothdeep all in one!
I'm sorry, but it's the motherfucking Marianas Trench son:
The Mariana Trench or Marianas Trench is the deepest part of the world's oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islands. The trench is about 2,550 kilometres (1,580 mi) long but has an average width of only 69 kilometres (43 mi). It reaches a maximum-known depth of 10.911 km (10,911 ± 40 m) or 6.831 mi (36,069 ± 131 ft) at the Challenger Deep, a small slot-shaped valley in its floor, at its southern end, although some unrepeated measurements place the deepest portion at 11.03 kilometres (6.85 mi).
So deep it put her ass to sleep.
Completely unrelated to the topic and from the pov of someone who has never seen this before I have to say that the final scene when he decides to enter the house while dozens of SWAT are on his tail... coupled with the car + neighborhood he was in seemed like it was made to bring back san andreas flash backs.