Insight
Adventurer
The issue isn't the number of surges, but rather the ability to activate them during combat. Everyone has a Second Wind, but then you need other healing powers to use more than 1 surge during an encounter.
True! Durn has 14 surges per day, but I suspect he will only use 1 or 2 during each combat. Second Wind (minor action for dwarves) for 1 and maybe a heal from Sariel for the other.
We'll just have to see how it shakes out. If we're really having problems getting enough heals, someone could re-roll another Leader.