Well, it depends if you want to follow the
FOC strictly or not - especially for low-points armies.
Usually for low points (under 400-500pts), the only restriction is 1+ Troops Choice.
Option 1 : Standard FOC (1HQ, 2+ Troops) (silly, but... who knows)
You actually don't have much of a choice
HQ : Captain or
Librarian - 100pts (if someone can confirm a Librarian is 100pts, that'd be great - in which case it's preferred to Captain due to psychic powers)
Troops 1 : Scout Squad (5 Snipers) - 75pts
Troops 2 : Scout Squad (5
BP &
CCW) - 75pts
Total : 250pts
You'll want the
HQ to go with the close combat squad, under support fire from the Sniper Squad.
You should be able to handle Tyranids Monstruous Creatures with the Sniper Rifles, but you'll have problems if
GK bring in Henchmen squads in vehicles (Razorback, etc) as you have almost nothing to harm them (except with the Librarian's psychic powers - Machine Curse, Might of the Ancients, Vortex of Doom, or Krak grenades in hand to hand).
Option 2 : Adaptative FOC (1+ Troops, 0-1 from all others)
Either :
Troops 1 : Scout Squad (4 Snipers, 1 Missile Launcher) - 85pts
Troops 2 : Tactical Squad (Combi-melta, Power Fist) - 125pts
Dedicated Transport : Razorback - 40pts
Total : 250pts
Or :
Troops 1 : Scout Squad (4 Snipers, 1 Missile Launcher) - 85pts
Troops 2 : Tactical Squad - 90pts
Dedicated Transport : Razorback (Twin-Linked Assault Cannon) - 75pts
Total : 250pts
Or :
Troops 1 : Scout Squad (4 Snipers, 1 Missile Launche, Combi-Melta) - 95pts
Fast Attack 1 : Land Speeder (Multi-Melta, Heavy Flamer) - 70pts
Heavy Support 1 : Predator (Heavy Bolter Sponsons) - 85pts
Total : 250pts
The latest one maybe being the most efficient, but a lucky can screw your plans !
If you want more troops, go with Scout Squads + Tactical ; if you want more armour, go with Dakka Predator (pretty cost-efficient at low levels) & Land Speeder.
Or, if you really want Telion & a fluffy Scout list, go for :
Troops 1 : Scout Squad (4 Snipers, Telion) - 125pts
Troops 2 : Scout Squad (
BP &
CCW) - 75pts
Fast Attack 1 : Land Speeder Storm (transport for Troops 2) - 50pts
Total : 250pts
Hope that helps !