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I've an upcoming game against chaos marines and was planning on this list. Any pointers or advice welcome.

HQ
Lysander
Chaplain w/ terminator armour and stormbolter

Elites
5 TH/SS terminators w/ LRR + MM
5 Tac terminators w/ AC
5 Sternguard w/ 5 combi-melta + pod

Troops
10 Marines w/ pg, lc + razorback
10 Marines w/ mg, lc + razorback

Heavy Support
2 Thunderfire cannons

The chaplain is with the assault terminators in the land raider and Lysander with the tac terminators will be deep striking. Bolster ruins with both techmarines and Lysander and bunker the lascannons and tfc's there

This list is very strong offensively, but the main issue is the lack of scoring troops. At 1850 points most armies have the firepower to easily kill 20 MEQ, even if they are in transports.
The TCFs/termies are always good, but I would really try to drop something to get at least one more tac squad.