I run Air Cav and there are some things you're going to need to know before you invest the rest of your fundage into this army.
1) Air Cav plays fast and furious. The poop hits the fan immediately. There's no lull time when you move into position. Either you scout move 12" away before the game starts or you outflank and drop right next to your enemy. My point being, heavy weapons in your units are a complete waste. You'll almost never use them. Drop that garbage and take advantage of the most powerful weapons are your disposal for the short range fire fight that will inevitably ensue. For example, you're going to need to stock up on Plasma and Melta to kill as many
MEQ's as possible in one round of shooting and meltas to dispose of transports and other vehicles.
2) Don't waste the points on doctrines. After you drop, either you'll kill enough to survive or your unit will be quite dead and it won't matter that they had some pretty, shiny new camo cloak to protect them. Expect your boots to DIE and horribly at that. You have first strike capabilities so take advantage of that and make you Vet's and
CCS as killy as possible. Don't stock up on the pointy bits like power weapons, or power fists for the matter. BUY MORE GUNS!!!

Trust me, you're going to need them. Plasma and Melta is your friend. Let the Valkyries be your anti-horde guardian angels and use the Vendettas to obliterate super heavy armor like Land Raiders and Monstrous Creatures. Anything else in between has to be handled by your Vets.
3) Forget the Storm Troopers. Buy more Veterans, you're going to need the extra scoring units because of the attrition rates. Buy Storm Troopers when you run out of Troops in your Force Org.
4) Drop the vox, you're not going to use it much and those few points add up over time.
5) The standard is nice, but you seldom use it because your boots are dead.
6) Exchange medic for Astropath (I don't have my book in front of me, but I believe that's the one that give you a bonus to your reserves roll) It will help more.
7) Take advantage of all those weapon upgrades in the
CCS. There are 4 of them after all. My
CCS runs with 4 plasma rifles and sometimes a plasma pistol to boot!
8) Definitely drop the lascannon on the Valkyrie. You have Vendettas for lascannon power.
Air Cav lists look awesome and are fun to play, but they're also completely unforgiving. If your first round of shooting doesn't go very well then your boots are stuck on the ground, essentially naked, waiting to get blown away by small arms and then charged. Remember, guns, Guns, GUNS! By as many as you can.
Up to about 1000 points Air Cav dominates games. The speed and fire power they give makes most others quiver in fear. Around 1500 it becomes tougher because other do what air cav does. . .but better. MechDar comes to mind. But, that's why you have so many Melta/Plasma weapons. Even plasma does a decent job at taking skimmers down. And when you're firing 6 or more shots into a vehicle with
AV 12 something usually happens.