Well, if you wanted this to be competitive or even tournament capable I'd do the following things:
A) Scrap the Level 2 Libby. He's too random in his effectiveness and doesn't compliment any unit much at all. If you want to have a support character I'm a firm believer in the
MoTF with maybe a combi-weapon.
Why? Well first of all he comes by default with a servo-harness, which can be used to either repair your Storm Ravens in flight or add another flamer and a TLPP (or even a combi-flamer if you get one) to your Sternguard unit. By the way, never take the heavy bolter with Sternguard. It adds so little to the unit and messes with its role so much it is almost never worth it, as they come with special issue ammunition which half the time is better anyway and doesn't snapfire on the move. Just take another heavy flamer.
Second of all, any objective you leave in the backfield and leave some men to hold can be put in a ruin where you can buff the cover save of the men you put inside it. Thirdly and fourthly, he has a pair of power fist attacks and a 2+ save for absorbing wounds in a pinch.
B) The
ML's in the
tac squads are pretty pointless, just take multi-meltas if any heavy weapon at all, because they're anti-Riptide, twice as good at anti-tank (and you'll probably be in
2D6 range with your
DS) and they're cheaper to boot. Yeah, you lose a S4 AP5 small blast, but its pretty naff anyway, and your flyers handle light infantry fine.
C) I'd add maybe one more
TH/
SS Termie to the assault squad. The defensive capability of the
SS can't be understated, and with only two if bad luck strikes you'll lose your immunity to being easily AP2 wiped very quickly.
D) The weird mix-match weapon combo's on the flyers really isn't that great, honestly the go-to load out for many people has always been Storm Talons with Skyhammers, and Storm Ravens with
MM's and
TLAC's for flexibility, cheapness and devastation.
E) The home objective
Tac Squad could do with either a heavy weapon or a grav-gun and maybe a combi-grav.
Here, have shameless self advertisement:
SM Tactical Squad, 5 men, with Grav Gun and Combi Grav - 95 points
Since the unit is going to be stationary often you're usually getting the full 3 shots of the GG's, and at 18'' range this means the unit is going to be able to fire quite often against aggressive armies that like to reach you and smash you off your objectives. For 95 points having 3 (6 on one occassion) AP2 shots that will be wounding on good rolls quite often in addition to 3-4 bolters and scoring, I think that's a neat purchase that will work well with some lists. For reference, against TEQ with the full firepower of both GG's you get 2.667 wounds on average. It suffers from two disadvantages in that A) a Flakk Missile combat squad costs the same and B) Its pretty useless if your opponent is something like Tau.
http://www.dakkadakka.com/dakkaforum/posts/list/554935.page