This is really hard for me, ND are one of my favorite bands of all time and I love everything they've done. I have to go with "Enemy Of The Music Business." I think that album perfectly blends the energy and anger of their early shit with the more refined musicianship of their later stuff. Everything they've done since has been pure gold too.
12/12 - Exhumed/Iron Reagan
1/11 - EyeHateGod/Cattle Decapitation
1/28 - Toxic Holocaust/Mammoth Grinder