What I wanted in this list was a functional army with at least some defense against psykers (mostly Tzeentch). In higher point battles, I'd like to add an Epistolary to help against the non-Tzeentchian psykers (Eldar, other Marines etc.). I would've used Ultramarines with an Honor Guard with each Tactical squad, but I wanted Traits. Originally, I was going to take 'Have Faith in Suspicion' but decided against it, since Librarians would help against psykers.
Now for tactics. Basically, I wanted a solid firebase to sit still and blow the enemy to pieces. I realize that this wouldn't do too well against the Tau, IG and other long-range armies, but against some other Marines and Thousand Sons, I figure it's got a fighting chance. As the list grows, I'd also like to add a 2-strong Speeder squadron to compensate for this blatant and exploitable weakness. Some people might say that I have too much anti-tank, but my usual opponents normally require such high-strength low-ap weaponry.
Trait Advantages:
(Courageous) Trust your battle-brothers
(Dutiful) Never despair
Major Drawback: Eye to Eye
Minor Drawback: Die Standing
HQ<?
Master Rector
Master
Power Weapon
Storm Shield
Bionics
Terminator Armour
Elite
Inquisitor Rustung
Inquisitor
Null Rod
Storm Shield
Artificer Armour
Troops
Tactical Squad Primus
8x Space Marines
Lascannon
8x Counter Attack and True Grit
Tactical Squad Secundus
8x Space Marines
Lascannon
8x Counter Attack and True Grit
Tactical Squad Tertius
8x Space Marines
Lascannon
8x Counter Attack and True Grit
Heavy Support
Devastator Squad Exuro
6x Space Marines
4x Missile Launchers
Predator Venator
Predator Annihilator
Lascannon sponsons
Dozer Blade
Extra Armour
Smoke Launchers
Total: 1000