I'm really split about this one,
how about this:
Ensnare:
T3, researchable
range of 5-7 or a loong cooldown
(this abilty is very potent)
(also we dont need 2 bio counters,
that would totally out maneuver terran t1-play,
fungal is more then enough to counter mass t1's)
Ensnare:
T2,
Range 8 (?)
no auto hitting mass units (or low priority at that),
it should be used against casters mainly
i like broodlings on t2, this gives the zerg a viable melee option at t2
which not just disappears in splash.
Price: 300
(at least, with this abilities)