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I have been adjusting my list since the 5th came out, and I find myself driven to a more mechanized force. Where I used to have infliltration as a key feature I find the latest dex + rules force mobility to be a priority. I also tried to focus on solid fire support while sticking with the whole chaos undivided theme.

Chaos Lord: Bolt Pistol & Daemon Weapon

6 Terminators: Reaper, Powerfist
5 Terminators: Heavy Flamer, Combi Melta, Powerfist

8 CSM: Melta, IoCG (Chaos Lord attached)
Rhino

8 CSM: AC w/Powerfist & Combi Flamer, Melta, IoCG
Rhino

8 CSM: AC w/Powerfist & Combi Flamer, Melta, IoCG
Rhino

8 CSM: AC w/Power Weapon & Combi Flamer, Melta, IoCG
Rhino

5 Chaos Bikers: AC w/ Powerfist, 2 Meltas, IoCG

2 Obliterators
2 Obliterators
1 Predator w/ TL Lascannons and Pintle TL Bolter

Looks quite good. Alpha Legion is hard to customize with the new Codex. Infiltrators are Elite and so are non-scoring.
Give the Termies combi flamers as everything gets cover saves, and give the Lord terminator armor letting him deep strike with the Termies. Then you have him where you want him to be...