I like the one ending in SS-SS-SS-DC-DC. Because that is pretty much all that's left to do with the runic power issue. There's a site that has a rotation like so, I'm unsure if it's quite best...everytime I use my unholy blight it produces too much threat for me.
http://img14.imageshack.us/my.php?image=picture1jms.png
DPS from the little knowledge I have is seriously fickle. I can pull 20 k on a target then the next target I'm in 1.2k which is nutty but it depends, I think someone in the beginning said something like that too. I don't know a lot so sorry just saying what I think.
That rotation I linked may not be the best, anyone use that?