I was encouraging folks to challenge my ear for "hard" music, that didn't happen apparently (even though there was an insinuation I was frontin') so here's my personal hard music picks:

New York Hard core: the way it is (various NYHC bands: Bold, Nausea, Gorilla
Biscuits, Warzone, Trip 6, Breakdown, Youth of today, Sick of it all,
Krakdown, Side by side, YDL, Supertouch - I think that's the order)
http://www.youtube.com/watch?v=Cswdy4euWUk
http://www.youtube.com/watch?v=DmIkkTzlmtA&feature=related

Negative FX - together/Negative FX/feel like a man
http://www.youtube.com/watch?v=OUrfVMlSMl4

DYS - Circle storm
http://www.youtube.com/watch?v=QLtwcuhjW9Y

Agnostic front - victim in pain
http://www.youtube.com/watch?v=X_akYLilAHk

DRI - couch slouch
http://www.youtube.com/watch?v=_uG51E656lg&feature=related

Judge - fed up
http://www.youtube.com/watch?v=1x1J02VTXuM

Krakdown - blinded
http://www.youtube.com/watch?v=7Horr6aFVxk

Negative approach - ready to fight
http://www.youtube.com/watch?v=w7l_nejSYl8

Straight Ahead - more important
http://www.youtube.com/watch?v=Il1ZVTu2Fd8&feature=related

Black Flag - padded cell
http://www.youtube.com/watch?v=0a1-VLoU7vs

Meat Puppets - in a car
http://www.youtube.com/watch?v=qKtGiLyka5A&feature=related

Black Flag – Damaged I
http://www.youtube.com/watch?v=coaHe5FuK14

Napalm Death - breed to breathe
http://www.youtube.com/watch?v=yBRzpvJgUB8

Deftones - Lotion
http://www.youtube.com/watch?v=r7lYbof7iwc

Bad Brains - tongue tee tie
http://www.youtube.com/watch?v=logN7CRzdDY

Nirvana - Beeswax
http://www.youtube.com/watch?v=0YklkclO83E

Nirvana - Curmudgeon
http://www.youtube.com/watch?v=nci-QgUAUnM

Ruins
http://www.youtube.com/watch?v=LHrZ3_Ru040