I quit listening to Anthrax right around the time they signed on John Bush as the singer. Nothing against John Bush, it was a coincidence. He was an awesome singer for Armored Saint -- one of the most underrated and overlooked 80s metal bands -- and he sounded like a good fit for Anthrax. I just thought their music went downhill. Their 'Among The Living' era is still the best.
Greg, have you heard of a band called In Flames? If you don't mind a little growling in leiu of singing, they are freakin awesome. Some of the best guitarwork I've ever heard. They have a lot of albums to choose from, but I'd recommend (in order) Whoracle, Colony and Clayman. I saw them at the Showbox a few months ago and the show was excellent as well.