I reckon a predator annihilator wouldn't go down too badly and if you want plasma cannons just get a couple of blister packs. can't help you with the missile luanchers but I usually go all lascannons, all heavy bolters or all plasma cannons
It's not so much not knowing how good/logical they are, but the preference to use my FA slots for Ravenwing additions. If I was playing any other chapter, I would have used them. XDBelial said:Assault troops=awesome. Especially when led by your chaplain. That's his forte.
The landspeeder tornado is great too, fast and multi-functional. They're a bit fragile, so you have to be careful using them, make sure that no one can get LOS on them. Experienced opponents will recognize it as a threat and go out of their way to take it out.