Your 1k list looks solid, but i would look into adding another troop option in the 500p, 3 troop options are a bit on the low side in my opinion for 1500 mission based games.
But for your 500p additional it's hard to fit it in. Incubi needs the archon, which leaves the razorwing. I also think you need another ravager, but thats me, i like the safety of the ravager. its long range, throw NS in and it is fairly durable as well. (for a DE unit of course)
In order to fit stuff that i want in the additional 500p i would dumb blasterborns for a ravager and distribute points somehow. not sure how. splitting one of the 10man troops into 2x 5man in venoms or something like this using the additional points given in the trade-in of blasterborns to ravager.
I am not calculating exact numbers here, it's all ballpark.
Like i said, i really like your 1000p, but i think it might limit your freedom in the additional 500p too much. But then again, it might be me being the limited one in not "seeing" it!
Anyways, best of luck