Black Horizons - definitely NOT 100% black metal. more of a mix of melodic death metal and melodic black metal. sounds A LOT like SotLB Dissection, but it has more death metal in it than that.
Crystalium - good French bm with decent production and often lots of death metal influence in the riffing technique. very good band.
Negator - melodic black metal with good production. quite accessible for black metal.
Legion of Darkness - epic black metal with lots of melody. good production and quite accessible
Mjolnir - epic and somewhat unique black metal. there is often death metal influence in the riffing technique. the guitars and drums are often very fast, and keyboards are often used as background.
Thunderbolt - good black metal with good production, with some degree of death metal influence.
Hegemon - great, overlooked, underrated French bm. the production is good and clear, and the riffs are more complex than those of the average black metal band.
All of these bands are good starting points in black metal for someone who is into death metal and is looking to expand into bm.