I actually went a completely different derection than this because I wanted to be able to solo if I wanted. This configuration allows me to solo a white and yellow lt pair(something my fire/emp cannot do).
I have:
propel - 1 acc/5 dmg(does about 45 dmg)..slow
lift - 1 acc/2 dmg(does about 20 dmg)..decently fast
gravity disortion - 1 acc/4 holds
cruch - 1 acc/ 1 timer
gale, crushing field, hover, and steamy mist are unslotted, fly is 3 slotted.
I am only 15 though, so anything can change......swift, health, stamina, gravity distortion field, freezing rain, hasten, O2 boost, thunderclap, and singularity will be chosen in that order....(i will also be adding acc to all powers)
Also, my friend has a 48 grav/storm and it is extremely soloable with large mobs, with no leadership powers at all. He uses thunderstorm all the time, if mobs are tight enough, it can hit multiple targets every strike.
....just my take)