I encourage you to check out these terminator threads, as well ask look for others. You will find lots of opinions on
CSM terminators!
http://www.dakkadakka.com/dakkaforum/posts/list/30/591803.page#6791465
http://www.dakkadakka.com/dakkaforum/posts/list/585331.page#6641765
http://www.dakkadakka.com/dakkaforum/posts/list/30/558180.page#6158473
http://www.dakkadakka.com/dakkaforum/posts/list/555707.page#6111991
http://www.dakkadakka.com/dakkaforum/posts/list/548199.page#5982488
http://www.dakkadakka.com/dakkaforum/posts/list/543748.page#5907959
My personal opinion is that
CSM terminators are cheap and can be deepstruck anywhere, so take them naked and use them as a distraction as only certain units can deal with them easily. This will force your opponent to re-position his elite units or otherwise have his whole army ground to a halt by a mere 100 ish point unit! The other thing I like about this idea is that terminators are elite choices, and as everyone knows the Elite section of the
CSM codex is full of rubbish, so filling it up with little squads of 3 terminators is fine.
My advice to you as a new
CSM player is to identify a theme for your army. Are you a follower of Khorne? Nurgle? Chaos Undivided? You get the idea. Find 2 or 3 units in the codex that made you choose
CSM over some other army. Why didn't you ask for Necrons for Christmas? Why
CSM?
Addressing what you have now:
Helbrutes- A great unit when used with one of the online dataslate formations, terrible when taken alone.
Cultists- Amazing cheap troop choice. Take them naked in large squad sizes usually, feel free to throw some flamers in there.
Chaos Lord- Give him relics like the Axe of Blind Fury or the Black Mace. Make him a close combat monster, and give him mobility (a bike or mount of some sort) and a bodyguard (usually bikers or chaos spawn)
Chosen- Confusing for new players as well as just terrible. The
CSM codex is full of units like this, just regular space marines with tons of un needed upgrades.
Warp Talons- same as chosen, but given you like them so much, i'd take them anyway. Make sure you keep them out of the way because they are very, very fragile for their point cost. I wouldn't take more than 5, otherwise they might draw attention.
Feel free to
PM me if you have more questions!