Pantera

They are much more thrashy than nu metallish. I wouldn't say that they are a pure thrash band either. IMO they are a thrashy metal band with lots of groove and bluesy/Southern rock influence. Good band. I only have Reinventing The Steel and Far Beyond driven. Both have some really heavy songs.
 
liek dude said, a thrashy band w/ southern influences. songs like fucking hostile w/ the thrash and songs like cowboys from hell bring the mix of southern rock and metal.
 
well, since they have been around since way back in the 80s playing glam/power metal, i dont think they are nu-metal. they had a major renovation with 1990s Cowboys From Hell. I believe they are heavy southern metal. THey have some good stuff.

I can't find any "nu-metal" qualities to them. however, like someone said alot of "nu-metal" bands probably look up to them or were influenced because they are a very famous band.