Alright fellow degenerates, time to playtest a new EC list. I have tried to accomplish two goals here: first, create a flavourful,* fun army list; second, staying as close as possible to an approved and balanced list (the BL) so that arriving at a playable and balanced list is as efficient as can be.
Notable changes:
This list is more closely aligned with the current Black Legion CSM list than previously. I have followed the core-support-elite structure of that list. Noise marines are not a core formation. You can still take plenty of them in the form of support formations and upgrades however. The army is plenty noisy. The armored company is still a support choice. Havocs are only an upgrade, not a stand-alone formation. So obviously this is not a carbon-copy of the current BL list.
The stalker AA tank is back! Stats are from Onyx's Iron Warriors V2 list so blame him

There are no battle titans in this list anymore. However, there are now three kinds of Slaanesh knights (two of which are small WEs) and a chaos Thunderhawk. Between the Slaanesh scout titans and these new additions, the EC should be well-equipped on the WE front. The T-hawks are in the WE section of the list, and the knights are limited to 0-1 formations (and expensive to boot) so hopefully that will provide balance.
Daemons are Slaanesh-only of course, but I've added the steed (basically a mounted daemonette, you get speed but are burdened with mounted) and the fiends are beasts with a different name.
Raptors, bikes, most of the characters, and chosen are ported from BL, rather than keeping unique EC units. I dropped the debaser (the defiler-thingy) as I couldn't find evidence that it exists anywhere in official canon (Lexicanum referenced a fan article only). The stalker accomplishes the AA role now anyway. The EC dreadnought, predator, and Land raider are still in there though. The dreadnought and land raider have heavier versions of the blastmaster. C'mon bring the noise!
That said, PLAYTEST PLAYTEST PLAYTEST. I want to make sure that the knight formation, limited 0-1 and expensive as it is, is not overpowered. That, and having multiple fearless formations roaming around on the table (i.e. lots of noise marines). Pact-wielding bikes in a T-hawk might also be a balance issue.
Please post here or PM me with any questions. "There are no stupid questions, only stupid people." Post battle reports in the appropriate forum and link/mention them here. I'm not going to say that someone's opinion is worth more than another's, but if you playtest and share your experiences with the list, your opinion will be worth more

Playtests against NetEA approved lists are the most valuable. Unsubstantiated opinions are worth less. Or worthless. Ok, enough blah blah blah. Have at it.
(did I mention that playtesting is important? PLAYTESTING IS IMPORTANT!!!!)
*see what I did there, govnah?