Here's my take:
Nexxxus (copper & graphite) will be a bit stronger than your Ulti Max, maybe 2 boards. Perhaps the strongest pearl I have used in terms of being able to handle some oil.
Aura is very clean with a strong move late. For me, I play a similar line as a stronger pearl, but with the predictability of a solid. In my first month I had a 290 and a 300 with it. You can add surface with good results, too.
DV8 Brutal Nightmare is one I have not thrown, but it looks like a possibly a little stronger than the Aura. Not sure, but that is my guess. Hope this helps.