2/3 availability with 2 cards.
The availability nerf is hard, but at 65% accuracy and SEAD immunity would probably make it worth it. It's faster than a Chap, so that would probably make up for it's low avail (dodge mortar SEAD).
I just wish there were a way to make it prioritize targets, or have the ground attack be a separate weapon with the same ammo pool so we can turn it off. Challenger/Chieftain Marksmen are handy for armored pushes (you can leave the gun on and not worry too much about SEAD), but adding the ADATS for missile defense in a push means it will too often get distracted by the ground units and not shoot at the planes/helos instead (generally if it sees the ground unit first).
But I suppose the targeting issue is more an engine problem than a game balance issue. Still, any buff to ADATS would be great. 105 or 110 points for the above would probably be ideal, as it's not quite PATRIOT effective, but can't be SEADed and is still relatively slow (unlike Starstreak). And some slightly more cost-efficient AA isn't that bad. The ADATS is proto, right? So that the dumb mixed BLU argument can't be used?