The grass is always more killy on the other side of the fence!

I'm a bit of a gaming magpie, I see something shiney and new and I get a bit over-excited but I pretty much always come back to Marines as my preferred army. This time my shiney new obsession is Tyranids. I've committed to finishing painting my Orks before I properly get stuck into them but that doesn't stop me from thinking about builds and poring over options in the black-tar heroine that is Army Builder. My thinking on the subject has gone from a fast, null-deployment style list with a flying Tyrant, Shrikes and Gargoyles, deep-striking Trygons and Raveners and Outflanking Genestealers to a more T6 spam list which currently looks as follows:

HQ
Hive Tyrant
Scything Talons, Lash Whip & Bonesword, Paroxysm and Leech Essence
Tyrant Guard
(2)

Elite
Hive Guard
(2)
Hive Guard
(2)
Deathleaper

Troop
Termagant Brood
(10)
Termagant Brood
(10)
Tervigon
Cluster Spines, Adrenal Glands, Toxin Sacs, Catalyst
Tervigon
Cluster Spines, Adrenal Glands, Toxin Sacs, Catalyst
Genestealers
(10)

Heavy Support
Trygon
Mawloc

This all adds up to 1630pts so I'm 120pts shy of the 1750 so my first question is what would be good to spend the 120 on? More 'stealers, upgrades for units or something else not currently in the list? I'm tempted to give the Tyrant the Hive Commander ability to give me a good chance of getting the 'stealers on turn 2 to support the Mawloc.

The second question is does the list look viable, does anything look like an obvious change is needed? Before you answer that I should probably explain my thinking on the List. The core of the army centres around the Monstrous Creatures: the Tyrant and his Guard, the Trygon and the two Tervigons, these guys will advance in a block, possibly screened by the Termagants - not from a cover save perspective, more to block charges though they will give cover to the Hive Guard.

Speaking of the Hive Guard, they add additional T6 targets to the list and asside from their obvious tank-killing utility they are mostly in the list to confuse target priority. The Tyrant, his guard and the Trygon are the main threats, they are given Feel No Pain by the Tervigons and should stand up to a fair amount of punishment so I'd hope they will live long enough to get something done. Asside from supporting the main block the Tervigons pump out babies and look to score some objectives if they are still alive on turn 5.

The Mawloc burrows on turn 1 for a 2nd turn deep strike, I've got a new perspective on the Mawloc, particularly in a list full of T6. With other bigger targets he's more of a distraction than a threat but he's going to be in your lines on turn 2 after a S6 AP2 pie-plate so hopefully some of the fire is going to go his way. Also his hit and run ability means he will most likely be able to re-burrow in his next turn (if he survives) even if he gets assaulted.

Deathleaper is in the list beacuse I like him and I like his rules, he can also guide the Mawloc's deep strike which is handy but not key to my strategy. I could probably be persuaded to drop him but for the moment he's my guilty pleasure. The 'stealers probably are going to be outflanking hopefully to support the Mawloc or Deathleaper but certainly to try to take out something.

Anyway, that's it. Looking forward to your thoughts.