I have a couple of tournaments coming up in the next month, as well as a few planned for next year. This weekend, I began putting together a potential list to try and for the upcoming events. ]
Most recently, I have been using the Dark Angels and Deathwatch as separate army forces.
The Dark Angels army performed well, but did suffer a few drawbacks in the force. The army had no reserves, meaning they were susceptible to the enemy firepower, as everything was on the board. The mobility in the army was provided by the Black Knights and Ravenwing Bikers, who suffered a bit in the army. They have some good firepower, but really lack the durability to stand up to the enemy firepower.
The Deathwatch hit hard, with the special issue ammunition and stratagems doing well to give them some strong firepower and some limited mobility.
I thought that it might be worthwhile to combine the two armies to get the best of both worlds. The Dark Angels to supply a solid firebase and some strong Plasma firepower, while the Deathwatch would give me some reserves to threaten enemy units, as well as giving me a degree of mobility with their deployment options.
So here is my first proposed army.
Battalion Detachment (Dark Angels)
Azrael
Primaris Lieutenant- Master-crafted Auto Bolt Rifle
Primaris Ancient- Bolt Rifle
5 Intercessors- Bolt Rifles
5 Scouts- Bolters
5 Scouts- Heavy Bolter, Bolters
5 Devastators- Heavy Bolter, Armorium Cherub
10 Hellblasters- Plasma Incinerators
Darkshroud- Heavy Bolter
Battalion Detachment (Deathwatch)
Watch Master- Guardian Spear
Watch Captain- Jump Pack, Thunder Hammer, Storm Shield, Bolt Pistol
10 Intercessors- Bolt Rifles, Bolt Pistols
10 Veterans- 10 Storm Bolters, 2 Storm Shields, 8 Chainswords
6 Veterans- 2 Missile Launchers, 4 Stalker Bolters
Auxiliary Detachment
Culexus Assassin
13 Command Points