Well, I'd drop the Landraider. One lucky shot and you have to rethink about the tactics. I've seen this happening early in the game.
Rhinos are quite resilient these days. Therefore, I'd replace the Landraider and Berzerkes with a
NM squad incl.
AC with doom siren, and 2 further Obliterators.
At the 1750 point level, I never use Sorcerers. I hide my
DPs partially behind the Rhinos so that they eventually get a cover save.