My Space Marines were my first true army, and over the years I have gathered the force below. What should I get next?

Sons of Darkness Strike Force Hurricaine

Trait- Blessed Be the Warriors
Drawback- Death over Dishonour

H.Q.- Chaplain Helguera: Master of Sanctity (100), Artificer Armour (20), Plasma Pistol (15), Terminator Honours (15), Frag and Krak Grenades (3)
153

Command Squad (5 Strong =75), Company Champion Azuris (20), Apothecary Daecis (25), Standard Bearer Tortallus (25), Plasma Gun (10), Frag and Krak Grenades (15), Terminator Honours (40), Veteran Sergeant (15), Power Fist (15). Furious Charge (18)
258

H.Q.- Epistolary Telchar (115), Terminator Armour (25), Storm Bolter (5), Vortex of Doom (30), Familiar (10)
185

Elites- Veteran Assault Squad Belisarius (8 Strong =176), Krak Grenades (8), Meltabombs (16), Plasma Pistol (5), Flamer (6), Veteran Sergeant (15), Plasma Pistol (10), Power Fist (15), Furious Charge (15)
266

Elites- Old One Calistro (Venerable Dreadnought= 125), Furious Assault (10)
135

Elites- Terminator Squad Adamantus (5 Strong= 200), Assault Cannon (20), 2 Chainfists (10)
230

Troops- Tactical Squad Ardite (10 Strong =150), Frag and Krak Grenades (30), Plasma Cannon (20), Plasma Gun (10), Veteran Sergeant (15), Plasma Pistol (10)
235

Troops- Scout Squad Damas (5 Strong =65), 4 Sniper Rifles (20), Frag and Krak Grenades (15), Veteran Sergeant (13), Auspex (2)
115

Troops- Scout Squad Tormag (6 Strong= 78), Frag and Krak Grenades (18), Heavy Bolter (5), Veteran Sergeant (13)
114

Fast Attack- Grey Knight Squad Arthas (6 Strong), Incinerator, Psycannon, Justicar with Psycannon Bolts
220

Heavy Support- Land Raider Damascus (250), Pintle Storm Bolter (10), Smoke Launchers (3)
263

Heavy Support- Land Raider Crusader Tempestus (265), Smoke Launchers (3)
268

Total=2442