I don't know if anyone has heard much about this guy (probably not many around here) or if this video has come up before. He isn't the most super technical, and this doesn't show him being super groovy or anything, but the tone is just wonderful and the amount of expression is far and beyond what most death metal bassists do, even if it is progressive death. Don't be turned off by that death word either, no vocals on this track.
http://www.youtube.com/watch?v=0jiclPmM0RM
He is the grooviest type of bass player I've for a band of this type as well, so they have that going for them. Personally my favorite band, but that's just me.
P.S. The goodness starts around 1:00