So Did We (panopticon's opener) is definitely an amazing Isis track, was my favourite song of theirs for a while..And Wills Disolve is genius.
You may actually prefer In The Absence Of Truth if 'melodic'/less harsh vocals is what you're aiming for.. It's generally got a lot more sung vocals and it's very melodic and droney.. But still got some crushing tracks like 'Holy Tears' which, whilst i generally don't give a shit about them, has a pretty epic video!
http://www.youtube.com/watch?v=rWjhxnVcmgg
Listening now - thanks. soudns cool so far.