HQ:Librarian (Epistolary) w/ Wings of Sanguinius & The Sanguine Sword; Infernus Pistol & Force Weapon (165pts)
Although it is tempting to fly and unleash S10 at the same turn, if the assault continues into another phase (or if you find yourself assaulted) your librarian will use Sword of Sanguinius and oops - his second power usage can only be spent for Psyker Kill - but S10 power weapon will kill most models outright, so I'm not quite sure these points are invested the best way. (or maybe I'm just a crazy fan of Epistolary+Sword+Rage+JP = "Proxy Mephiston")
Troops: 10-Man Tactical Squad w/ Meltagun & Missile Launcher; Sergeant w/ storm bolter, power weapon & melta bomb; dedicated transport: rhino w/ hunter-killer missile (258pts)
Not sure about HKM and storm bolter. Besides, storm bolter denies you one PW attack, that's no good, imho.
Are you going to combat-squad them, by the way?
Troops: 10-Man Assault Squad w/ bolt pistol & chainsword, two flamers; Sergeant w/ Infernus Pistol & Power Weapon (230pts)
They are fine as they are.
Fast Attack: Baal Predator w/ Flamestorm Cannon; Heavy Flamers side sponsons; Storm Bolter (150pts)
Enemy antitank would shoot at Rhino and at this Predator. And, after it catches "Immobilized" result, it is 150 wasted points. Also, isn't it 155pts?
So I think with such level of target saturation for enemy antitank classical TLAC+HB would be a safer option (better cover usage, better endurance for taking hits).
Heavy Support: 7-Man Devastator Squad w/ 3 Missile Launchers & 1 Lascannon; 2 Marines w/ Bolters; Sergeant w/ Storm Bolter & Power Weapon (195pts)
I think that if your devastators need power weapon in the battle - well, they're screwed fair and square. Also, Sarge has a Signum, so he should be spending his shooting phases giving some lascannon WS5, and not trying to kill anything with his storm bolter.
So, the quick summary:
1) Don't like half the Epistolary spent on the upgrade you can by for 25pts. Also, 10-man squad with Preferred enemy and S10 Libby is scary as hell. (requires some point shaving)
2) PW in tac squad denies you one CC attack, PW for Devs should never be used in normal game.
3) Devastators may benefit from Razorback with some TLLC - they don't even have to embark, but it would block LOS for your opponent, give you some extra long-range killiness, allow you to redeploy, if the need arise and draw some fire away from Rhino and Pred. (requires some point shaving)
4) First Baal in the army should be dakka, imho.
5) Baal can live without stormbolter and Rhino can live without HKM - you may find wiser investment for these points.
6) Lack of Sanguinary priests in 1000pts BA force is an insult to the codex. Try to find a way to get one for your assault squad, seriously.
For the Emperor and Sanguinius!