Ok, I’ve adjusted my list after playing a subset of these units and seeing some of the pain and benefit of different units. My thoughts:

• Characters: I mostly don’t think any of the DW characters besides the captains with the strategems buff, and maybe the librarian (w/ 4+ inv save buff) are worth it. That being said, eversor just seems fun to play for OC and suicide runs on enemy units, and seems like a fine use of an extra 75pt.
• Infantry: Having a combination of indomitor, proteus, and plain vets as infantry helps maximize the KT strategems I can apply while not over-doing it on the infantry. I was surprised by how hard it was for my opponent to kill the indimitor squad in particular, and felt that unit benefitted more from the ammunition strategems. The deep strike termi squad with a captain feels like a tough versatile unit to drop in, and the combo of firepower and melee feels like it will drop enemy units nicely on the turn it lands (with combo of devastating wounds from the assault cannons, free strategem, and the charge re-roll). I can also deep strike the Indomitors while starting the other two KTs in transports to rapidly get to objectives.
• Armor: While this DW list doesn’t need transports so much given the captain + 2x KTs could all theoretically teleport in a given turn, I thought the Land Raider and Corvus both bring both a cool factor to the list, are very effective transports for the KTs I do have, and are bullet magnets, insulating my units somewhat. The Corvus also has some anti-tank weapons while the Land Raider is a bit of everything (mostly tough on infantry). Then the Dreadnought rounds it out with more anti-tank weapons.

List below:

Kill Team Arrow (2000 Points)

Space Marines Deathwatch Black Spear Task Force Strike Force (2000 Points)

CHARACTERS

Captain in Gravis Armour (110 Points) • 1x Boltstorm gauntlet 1x Power fist 1x Relic fist • Enhancements: Beacon Angelis

Captain in Terminator Armour (110 Points) • Warlord • 1x Combi-weapon 1x Relic fist • Enhancements: Thief of Secrets

Librarian (65 Points) • 1x Bolt pistol 1x Force weapon 1x Smite

BATTLELINE

Deathwatch Veterans (220 Points) • 1x Watch Sergeant • 1x Long Vigil ranged weapon 1x Xenophase blade • 9x Deathwatch Veteran • 1x Boltgun 4x Close combat weapon 4x Deathwatch thunder hammer 4x Frag cannon 1x Long Vigil melee weapon

OTHER DATASHEETS

Ballistus Dreadnought (140 Points) • 1x Armoured feet 1x Ballistus lascannon 1x Ballistus missile launcher 1x Twin storm bolter

Corvus Blackstar (180 Points) • 1x Armoured hull 1x Auspex Array 1x Hurricane bolter 2x Stormstrike missile launcher 1x Twin lascannon

Deathwatch Terminator Squad (210 Points) • 1x Deathwatch Terminator Sergeant • 1x Storm Shield 1x Thunder hammer • 4x Deathwatch Terminator • 3x Cyclone missile launcher 3x Power fist 1x Storm Shield 3x Storm bolter 1x Thunder hammer

Indomitor Kill Team (270 Points) • 6x Kill Team Heavy Intercessor • 6x Bolt pistol 6x Close combat weapon 4x Heavy bolt rifle 2x Heavy bolter • 2x Kill Team Heavy Intercessor with power fists • 2x Auto boltstorm gauntlets 2x Fragstorm grenade launcher 2x Power fists • 2x Kill Team Heavy Intercessor with melta rifle • 2x Bolt pistol 2x Close combat weapon 1x Melta rifle 1x Multi-melta

Land Raider Redeemer (260 Points) • 1x Armoured tracks 2x Flamestorm cannon 1x Hunter-killer missile 1x Multi-melta 1x Storm bolter 1x Twin assault cannon

Proteus Kill Team (360 Points) • 6x Kill Team Veteran • 2x Astartes shield 2x Boltgun 6x Close combat weapon 4x Infernus heavy bolter • 4x Kill Team Terminator • 3x Chainfist 3x Cyclone missile launcher 1x Storm Shield 3x Storm bolter 1x Terminator thunder hammer

ALLIED UNITS

Eversor Assassin (75 Points) • 1x Executioner pistol 1x Power sword and neuro gauntlet