Paul Gonzenbach from
the jim yoshii pile-up has a really beautiful voice [and a mind for lyrics that compliments it perfectly]
Aaron Scott from
MARATHON has some really powerful vocals.
Chuck Ragan, not during Hot Water Music, but his
solo stuff has an amazing voice. it's not clean or pretty by any means, but there's just so much passion in his vocals. I can't help but love it.
....actually, in his work with Hot Water Music as well.