I picked up my copy of the Codex today. Having a look through, I thought about this, very elite and very expensive little force!
Chaplain with Jumpack and Grav pistol
Vanguard Squad - 6 marines (Relic blade, thunder hammer, 4x grav pistols)
Sternguard Squad - 6 marines (Power weapon, heavy flamer, 4x combi weapons)
Drop pod
3x
Dev Centurions with Grav cannons /
amps and missile launchers
In order to trim this down, I can take out 1 marine each from the Vanguard & Sternguard squads (1x combi and the thunder hammer) which free's up 66 points. Take off another grav pistol from somewhere and that give me 81 points - enough for a Stalker or hunter with a Storm bolter.
The idea is that the Chaplain and the Vanguard guys go warlord hunting, while the sternguard drop in front of something nasty like a wraitlord and deal with it. The centurions sit centre table and generally make a nuisance of themselves targeting anything with decent armour.
I should probably say that I've created this list to complement my Dark Angels army. That, and I want to paint them all up in Deathwatch colours and, due to the £15,50 cost of the upgrade sprue, don't want a lot of troops!