wow this thread has gone to crap.... :(
first off (balloons/wallbreakers/undead wizzards, skele healer?) are all just copies off regular troops, and what are u going to make the witch into?? her own flipping army??? whay would u even need other troops when u have a witch that can make anything u need? while we are at it how about she make an undead pekka? ooh wait dont forget the undead "dragon" NO way!
ok now! for what my opinion is worth here is what i think should happen.
upgrade cost=100k de
research time=12-14 days
witch dps=40
witch hp=120
skeleton dps=35
skeleton hp=40
summons=5
max=10
cooldown=4-5 s
changes in witch= she gets a black staff
changes in skeletons= they get a black sword and a black guards helmet
she can now summon faster more and stronger units.