Yeah, Tom's vocals are the only thing I like about Slayer. But I don't know if I'd put any thrash vocalist in my Top 10 metal vocalists. Hell, even 20. But that's probably because I base things like top vocalists, guitarists, bassists, etc purely on techincal ability.
5/23 Giant Squid/Botanist/Cormorant
5/30 Alter De Fey
10/10-11 California Deathfest