I've been really interested in seeing Manipulation/Summon. What's interesting about it is that no matter what you choose in your primary, you're guaranteed an attack from pets (since the first summon is always Power #2, and Power #1 is something blasty).
So then I figure change the progression of pets from there - instead of ending up with 3 (level -2), 2(level -1), 1 pets, you could do something like 2 (level -1), 1, 1 for pets, introducing the special ones like combat medic sooner. So you have pets, but less than a MM, and at least one guaranteed attack. And then the rest of the Manipulation sets are extremely varied and have a lot of options, so your own character is quite customizable.
And then just patch the holes with a passive.