This is a list I've been trying out lately, was wondering if you could provide some suggestions.

HQ
Librarian - 100
Librarian - 100
TROOPS
Tactical Squad 1
Melta, ML
Sgt. with power fist - 195
Tactical Squad 2
Melta, ML
Sgt. with powerfist - 195
Tactical Squad 3 with razorback (heavy bolters)
ML, flamer
sgt with power weapon - 225
Scout Squad (5 man)
Sniper Rifles - 75
ELITE
Sternguard (10) with Rhino
Sgt. with power fist - 310
FAST ATTACK
2 land speeders
2 heavy flamers, 2 multi meltas - 140
HEAVY
Land Raider Crusader
with multi melta - 260
Land Raider – 250
Total Cost: 1850


The Librarians both generally take Null Zone and Force Dome, occasionally Vortex of Doom. Tact Squads 1 and 2 ride in the LRs, along with the Librarians for support.