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List looks good. If you want the Princes to take a Psychic power from the 6th edition rulebook, you need to have a power to replace. Meaning, take the cheapest codex power (Doombolt, 10 points) and then replace it with a book power, most likely from Telepathy. Or for 15 points, you could get Nurgle Rot - great for sliding right into the middle of his Troops units and nuking everything within 6" (well....nuking might be a strong term, hehe).

The Plague Marine Squads look good, but I think I would run 7 of them (for fluff and durability).

I also think running only two Squads of Troops at 1500 points is a mistake. The general rule of thumb is one Troop Squad for every 500 points, so another Squad of Plague Marines (or even CSM with MoN) is sorely needed. To me, the Terminators are the first thing I would drop. Spending 40 points to give 3 models Mark of Nurgle is too expensive.

My recommendation would be to drop the Termies, and drop 1 Oblits from each Squad.

The modified list would look something like this:

HQ:
1 Daemon Prince, 160 pts Mark of Nurgle; Psyker, Doombolt; Wings

1 Daemon Prince, 160 pts Mark of Nurgle; Psyker, Doombolt; Wings

Troops:
7 Plague Marines, 271 pts; Plasma gun x2; Rhino
Plague Champion w/ Power Fist; Plasma PIstol; Personal Icon

7 Plague Marines, 271 pts; Plasma gun x2; Rhino
Plague Champion w/ Power Fist; Plasma PIstol; Personal Icon

7 Plague Marines, 271 pts; Plasma gun x2; Rhino
Plague Champion w/ Power Fist; Plasma PIstol; Personal Icon

Heavy Support:
2 Obliterator Cult, 150 pts

2 Obliterator Cult, 150 pts

1478 total

Spend the last 22 points on Pintle-mounted Combi-Plasmas for your attacking Rhinos, or buy one Havoc Launcher for your Defensive Rhino.

As always, just my 2¢. Hope it helps.

Your math is correct. 286 points. Not sure where I went wrong. Probably didn't add the Plasma Pistol for the Champ. My bad >.<