The first thing I thought when I saw the model was "Wow, I found my Abbadon model." Indeed, one of the main reasons I have not run Abbadon is because I hate his model. That also means I've never built a chosen-as-troops list. I presume you just sort of maximize damage output. I had the idea in the following way.
First I thought, well you'd have to chaos-ify him a bit. But then it struck me that you could do Abbadon as is, with units of Sons of Horus as chosen, and a unit of justaterin terminators in a land raider proteus (which basically has the same armaments as the CSM LR).
Of course, I still want to include a blob of 30 Cultists and a lord in the backfield to sit on an objective, so for that I'd probably buy 3 squads of Guardsmen, give them 3 flamers, stick a Legion Champion in it.
Abbadon would run with a unit of Justaterin Terminators in the LR Proteus (or a MK IIB). Take 5 chosen squads with rhinos, you could buy the MK IV bundle and some special weapons and assault weapons packs to equip them.
This isn't intended to be a highly competitive list, it doesn't have Heldrakes or heavy support, but it would be fun to put together, especially with these tanks:
Oh and I just had a clever idea. Add one open hatch with a marine and give him one of the spare Missile Launchers from the heavy weapon kit to represent havoc launchers.
+++ Abby and Friends (1999pts) +++
+++ 2000pt Chaos Space Marines 6th Ed (2012) by SN Roster (PrimaryDetachment)) +++Selections:
Chaos Space Marines 6th Ed (2012) by SN (Primary Detachment) Selections:
+ HQ + (390pts)
* Abaddon the Despoiler (265pts) (Champion of Chaos, Eternal Warrior, Fearless, IndependentCharacter, Mark of Chaos Ascendant, Veterans of the Long War, WarlordTraits: Black Crusader)
* Chaos Lord (125pts) (Champion of Chaos, Fearless, Independent Character) Blight grenades (5pts), Mark of Nurgle (15pts), Sigil ofcorruption (25pts) * Power Armour (15pts) Bolt Pistol, Lightning Claws (15pts)
+ Elites + (395pts)
* Chaos Terminators (395pts) (Deep Strike) Chaos Land Raider (230pts), Mark of Nurgle (24pts) * Terminator (36pts) Combi-melta, -flamer, -plasma (5pts) * Terminator (36pts) Combi-melta, -flamer, -plasma (5pts) * Terminator (36pts) Combi-melta, -flamer, -plasma (5pts) * Terminator Champion (33pts) Combi Bolter, Power Weapon
+ Troops + (1214pts)
* Chaos Cultists (171pts) (Champion of Chaos) 26x Autogun (26pts), Champion's upgrade (10pts), 3x Flamer(15pts), 30x Squad models (champion included) (120pts)
* Chosen (Troops) (202pts) 5x Chosen (90pts), 4x Replace boltgun w/ Meltagun (40pts) * Chaos Rhino (47pts) (Repair) Combi-bolter, Havoc Launcher (12pts), Searchlight, Smoke launchers * Chosen Champion (25pts) (Champion of Chaos) Bolt Pistol, Gift of mutation (10pts), Power Weapon (15pts)
* Chosen (Troops) (202pts) 5x Chosen (90pts), 4x Replace boltgun w/ Meltagun (40pts) * Chaos Rhino (47pts) (Repair) Combi-bolter, Havoc Launcher (12pts), Searchlight, Smoke launchers * Chosen Champion (25pts) (Champion of Chaos) Bolt Pistol, Gift of mutation (10pts), Power Weapon (15pts)
* Chosen (Troops) (232pts) 5x Chosen (90pts), 4x Replace boltgun w/ Plasma gun (60pts) * Chaos Rhino (47pts) (Repair) Combi-bolter, Havoc Launcher (12pts), Searchlight, Smoke launchers * Chosen Champion (35pts) (Champion of Chaos) Bolt Pistol, Gift of mutation (10pts), Power Fist (25pts)
* Chosen (Troops) (232pts) 5x Chosen (90pts), 4x Replace boltgun w/ Plasma gun (60pts) * Chaos Rhino (47pts) (Repair) Combi-bolter, Havoc Launcher (12pts), Searchlight, Smoke launchers * Chosen Champion (35pts) (Champion of Chaos) Bolt Pistol, Gift of mutation (10pts), Power Fist (25pts)
* Chosen (Troops) (175pts) 5x Chosen (90pts), 4x Replace boltgun w/ Flamer (20pts) * Chaos Rhino (35pts) (Repair) Combi-bolter, Searchlight, Smoke launchers * Chosen Champion (30pts) (Champion of Chaos) Bolt Pistol, Gift of mutation (10pts), Lightning Claws(15pts), Melta Bomb (5pts)