Cheers everyone, for the feedback. Next up is a squad of tactical marines with a Missile Launcher. The one from the HH:BaC box.
Here's pics of all the marines in different shots.
First up is a standard bolter marine. I just love the combination of the acquila breastplate with the MkIV head. If I'd be playing HH Emperor's Children, all my marines would have this combo.

Second, another bolter marine, who is wearing all kinds of armour. I really like to mix and match, taking full advantage of the compatibility of all the armour marks.

Third, here's the Sergeant. I went full mental on this guy. He has the MkII breacher helmet with plume (gotta love the breacher helmets for their almost Predator-like appearance), laurels all over the place, some pteruges for his loins, and an awesome, awesome back banner. I love this guy.

Fourth, the missile launcher guy. I gave him the 40K devastator legs (all the heavy weapon toting dudes in my 1250 points list will have these legs) and the MkIV helmet with the extra scope/visor like thing on his helmet.

And finally, the second comms specialist. This idea really grew on me and I'm planning on putting one in every squad from now on. If anyone has more Imperial Guard vox casters or Defense Line Vox stations and wants to trade them, please PM me. I need two of these:
The conversion is super simple: just put two of the space marine backpack engine exhausts on the sides of the thing and stick it on the marine's back. 

That's it! I also in a stroke of perfect timing got the FW Imperial Fists contemptor in the mail, so I'll be working on getting the two HH:BaC Kherese Assault Cannons on that thing, and painting it up. Or should I do the Deredeo first?
Thanks for looking and feedback most welcome!
Replies:
@Flint13: Haha thanks! Creepy flying babies FTW, right?
@Teetengee: Creepy flying babies can be found in this post, on page 60. Trust me, the link is SFW. 
@grizzly_bear: You do have a pretty big headstart. Also, since when is this a contest 
@Barabbas Sogalon: Haha thanks buddy. I think I'll break my own rule and try to paint five marines in one go, as I've developed a pretty fast method of painting Imperial Fists by now. Turns out, if you satin varnish before each GW Shade, your work time is cut in more than half, and it goes on smoother and easier!
@Black_out: Averland sunset and a white basecoat are your friend, buddy.
@Knight of the Raven: Thanks bro! Yes, four razorbacks do look awesome, no? Imagine what eight would look like!
@Plains of War: Cheers! Glad you spotted it. And yeah I did it pretty much exactly for the reason you said. I also have a Night Lord devastator with Missile Launcher standing like that (only he's not pointing, but holding a missile), for the exact same reason.