I'm working on a striker for the newest lair assault. For people who don't know, lair assaults are one encounter (or sometimes two) that are extremely difficult and therefore require a party of optimized characters. I'm bored of my charging thief, so I was looking to play a different kind of striker. However, I still want to be highly optimized / putting out massive amounts of damage. What kind of classes / attack powers would be optimal for this kind of campaign setting? I was thinking maybe an archer ranger that utlizied spitting cobra stance, since its a daily power that lasts until the end of the encounter. Thoughts?