wowser, where to start?? (staff set!!)
MELEE
-street fighting, depends on what this is actually, but may be kool
-elec hammer, hmmm, i can see stuns at work here, shooting elec bolts would be sweet, but they wont give range to a tank. -Maybe a short arc, yes could work....
-energy blade, afraid it would be too much like fire/ice swords
-psi weaponry, has potential, but animation would prob be like sets in use currently, so....
-dual blades, these would really rock in the hands of a scrapper, but they already have 2 sets of sword. if you're gonna have dual weapons how about dual pistols, like gunslinger, or knives, maybe scyes (sp?)
ball & chain, to those of us married it means something altogether different, jk honey! this one has potential, new weapon, new animation. leaning that way..
shields, i feel it belongs on the defensive side of things, sorry Cap! (rip)
DEFENSE-
-density control, no clue, could be meat, could be cake, we'll call it meatcake! (ty George)
-force field, unless it is vastly different from bubblers, i'd say we have this covered already
-willpower, how to animate this?? (multiple slaps to head as enters melee?!)
-vibration, great now all the ladies will only want to solo!!! this set could be kool, phasing..maybe?
-growth, nice if they could make it work, but indoors/ underground??
-shield def., this one would be my pick, but how do you reconcile animation with handheld weaponry??
my vote then

if you still care cause i have rambled on soooo long)
(STAFF set) ball & chain, electric hammer.
shield, vibration
new weapons, ahem staff, dual tomahawks, knives, good old tried and man-killing tested spear or lance.