Making Planetfall...

Orbital defenses have been breached, the Hive Fleet is entering orbit, and the Mycetic Spores are on the way. Consumption begins in roughly twelve hours. 

After some more testing I decided to change up the list, and like this version much more. It's still not as much anti-tank as I'd like, and Mission 2 will be pretty unforgiving in my deployment, but hits much harder in assault and doesn't hemorrhage kill points quite as easily. The Swarmlord proved to be even more useful than I had anticipated; Genestealers and Warriors with Preferred Enemy are certifiable nightmares, and the 18" allows for much more flexibility than Old Adversary. 

HQ:

The Swarmlord (280), 1 Tyrant Guard w/ rending claws and scything talons (60) - 340

Hive Tyrant(170) w/ Leech Essence, Paroxysm, Scything talons, TL BL Devourers(15), Wings(60), Hive Commander(25)  
-270

Elites:

2 Hive Guard-100

2 Lictors - 130

2 Lictors – 130

Troops:

10 Termagants -50

Tervigon (160) w/ Dominion, Cluster spines,Catalyst(15),Toxin Sacs(10),scything talons(5) -190

10 Genestealers - 140

10 Genestealers - 140

5 Tyranids Warriors w/ lashwhip & bonesword(15), toxin sacs(5), rending claws, (200) in Mycetic Spore(40)

-290

Fast Attack:

15 Gargoyles - 90

Heavy Support:

Trygon - 200

Trygon - 200

Carnifex (160) w/ TL BL devourers (15)x2 (190) in Mycetic Spore(40) - 230