Honestly, I'm just going for a UA to have the attack buff. The moves are nice and all, but they aren't spectacular - unless you're making a Buccaneer. Shark Wave would help them out since they are lacking in the quick-ranged-skill department. I assume most others are going to be going for the exact same thing.
UA I/L not worth it since you have the ability to freeze sure you think you can burn them but note your fighting fire monsters so the damage won't really matter since your freezing will kill them fast!
F/P won't work since it does not stack as 1st post said.