Hmm, that's a mean 1500 point list.
If it's at all possible, scrounging up points for dirge casters on the rhinos would be marvelous and in like with Slaaneshi fluff. I think it would be worth dropping, say, one of the Icons of Vengeance to fit in—because, hey, losing even one Biker to Overwatch would be quite painful.
Also, I'd consider putting meltaguns on the bikers who aren't accompanied by the Lord—give you a bit more mobile anti-tank besides your LasPreds.
What sphinx of plascrete and adamantium bashed open their skulls and ate up their brains and imagination? Imperator! Imperator!