Recommend me some dark ambient

Nothing - Silence Came Back in Filling Jagged Spaces
Gruntsplatter
The Waking Cold
Robyn Miller (specifically the Riven soundtrack)
anything off the crionic mind label
Coil
 
Ordo Rosarius Equilibrio *
Raison d'Etre *
Arcana
Sophia
Lithium
Karjalan Sissit *
MZ412
Sanctum
Coph Nia *
Letum *
Aghiatrias
Megaptera
Nod
The Protagonist
Brighter Death Now
Desiderii Marginis
Penitent
Institut
Leak *
Tvmvlvs Seraphim

...and many other. Some of the above have slightly industrial and/or neo-classical influences. Bands marked with * are strongly recommended.