Dropkick Murphys. Enough energy and agression for lifting, but also enough variation to not get boring.
Lamb Of God, Arch Enemy, Ministry, Pantera, Sepultura, Soilwork etc
Pantera, cowboys from hell
Metallica
Drowning pool
Rob Zombie
Anything to help pick up the tempo and forget about the pain. Hard rockin and loud helps to ellevate your mood and physche you up. Harder and louder = intensity and determination
Bullpup