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I am not trying to make a hyper competitive list, just one for normal games as even the tournaments in my area are generally very laid back and relaxed. I don't have much for AV above 12 to worry about in my area, and most people play rather infantry heavy.
I am still very new to Tyranids, though this is my 5th army. I did think about dropping a few points and removing the single venomthrope or a zoanthrope to bring a void shield generator for the living artillery node to make the enemy punh through the AV 12 before they can hurt them.

HQ:
Hive Tyrant: Wings, 2x TL-Devourers
Hive Tyrant: Wings, 2x TL-Devourers

Troops:
Tervigon: Cluster Spines
30x Termagaunts
Tervigon: Cluster Spines
30x Termagaunts

Elite:
2x Venomthropes
1x Venomthropes
3x Zoanthropes
- 1x Neurothrope

Formation:
Living Artillery Node

Or:

HQ:
Hive Tyrant: Wings, 2x TL-Devourers
Hive Tyrant: Wings, 2x TL-Devourers

Troops:
Tervigon
30x Termagaunts
Tervigon
30x Termagaunts

Elite:
1x Venomthrope
1x Venomthrope
2x Zoanthropes
- 1x Neurothrope

Formation:
Living Artillery Node

Fortification:
Void Shield Generator: 2 extra void shields

I strongly suggest Thorax hives, even if AV is not an issue Templates are made for cleaning out Infantry.

I like your second list. You shouldn't need three venomthropes, and three zoanthropes should be plenty. The void shield generator should add more to your survivability than those extra 'thropes will. I second pinecone's recommendation of thorax hives, but I otherwise like the thought of forcing the enemy to deal with a constant stream of termagaunts while pelting him with flyrants and living artillery.