Monks something like fists of Lightning: full stacks of grese Lightning at all times. (You can't have it up at same time as fire so lose that %5 more attack buff to even it out. Also can only use fists of lightning for 30 seconds.
Gives reason to swich fists in battle.
Same with something like fists of Water: maybe something like recover %5 of HP with each attack. Something like blood bath.
I just like the idea of switching in battle so you don't have fists of fire 24/7 and change as battle goes.