Here are a pair of lists I came up with for a local Hall of Heroes tourney... when critiquing know that I only have this one Tyrant model, so it's those biomorphs or nothing, and I don't have any leaping warriors yet.

List One

HQ: Hive Tyrant (3#, 272 Pts)
1 Hive Tyrant
Enhanced Senses +1 BS; Extended Carapace +1 Save; Toxin Sacs +1 St; Barbed Strangler; Venom Cannon; Synapse Creature; The Horror
2 Tyrant Guard
Rending Claws; Scything Talons

Troops: Gaunt Brood (10#, 50 Pts)
10 Gaunt Brood
Spinefists

Troops: Gaunt Brood (10#, 50 Pts)
10 Gaunt Brood
Spinefists

Troops: Gaunt Brood (10#, 60 Pts)
10 Gaunt Brood
Fleshborer

Troops: Hormagaunts (13#, 130 Pts)
13 Hormagaunts
Scything Talons

Troops: Hormagaunts (13#, 130 Pts)
13 Hormagaunts
Scything Talons

Fast Attack: Ravener (3#, 120 Pts)
3 Ravener
Rending Claws; Scything Talons (x1)

Elite: Warriors (4#, 144 Pts)
4 Warriors
Enhanced Senses +1 BS; Extended Carapace +1 Save; Toxin Sacs +1 St; Scything Talons (x1); Deathspitter; Synapse Creature

Heavy Support: Zoanthrope (2#, 130 Pts)
2 Zoanthrope
Toxic Miasma; Synapse Creature; Warp Blast; Warp Field

Heavy Support: Carnifex (1#, 223 Pts)
1 Terrorfex
Adrenal Glands +1 In; Adrenal Glands +1 WS; Bonded Exoskeleton; Extended Carapace +1 Save; Flesh Hooks; Regenerate; Reinforced Chitin; Tail Weapon - Mace; Toxin Sacs +1 St; Tusked; Scything Talons (x2)

Heavy Support: Carnifex (1#, 188 Pts)
1 Gunfex
Enhanced Senses +1 BS; Extended Carapace +1 Save; Reinforced Chitin; Barbed Strangler; Venom Cannon

Total Roster Cost: 1497

List Two

HQ: Hive Tyrant (3#, 272 Pts)
1 Hive Tyrant
Enhanced Senses +1 BS; Extended Carapace +1 Save; Toxin Sacs +1 St; Barbed Strangler; Venom Cannon; Synapse Creature; The Horror
2 Tyrant Guard
Rending Claws; Scything Talons

Troops: Gaunt Brood (10#, 50 Pts)
10 Gaunt Brood
Spinefists

Troops: Gaunt Brood (10#, 50 Pts)
10 Gaunt Brood
Spinefists

Troops: Gaunt Brood (12#, 72 Pts)
12 Gaunt Brood
Fleshborer

Troops: Hormagaunts (13#, 130 Pts)
13 Hormagaunts
Scything Talons

Troops: Hormagaunts (13#, 130 Pts)
13 Hormagaunts
Scything Talons

Elite: Warriors (4#, 154 Pts)
3 Warriors
Enhanced Senses +1 BS; Extended Carapace +1 Save; Toxin Sacs +1 St; Scything Talons (x1); Deathspitter; Synapse Creature
1 Warriors
Enhanced Senses +1 BS; Extended Carapace +1 Save; Toxin Sacs +1 St; Scything Talons (x1); Venom Cannon; Synapse Creature

Heavy Support: Carnifex (1#, 188 Pts)
1 Gunfex
Enhanced Senses +1 BS; Extended Carapace +1 Save; Reinforced Chitin; Barbed Strangler; Venom Cannon

Heavy Support: Zoanthrope (2#, 130 Pts)
2 Zoanthrope
Toxic Miasma; Synapse Creature; Warp Blast; Warp Field

Heavy Support: Biovore (5#, 201 Pts)
3 Biovore
Bio-acid Spore Mines
Toxin Spore Mines

Fast Attack: Ravener (3#, 120 Pts)
3 Ravener
Rending Claws; Scything Talons (x1)

Total Roster Cost: 1497


I know there's going to be a lot of "get rid of the biovores" comments for the second list, but they've done well for me in the past. People playing against Tyranids don't seem to understand that they CAN get bombed indirectly.