So... I am curious... is there a quality that you can get for vehicles and what not?

I guess a best quality craft would have refractor shields, advanced targeting equipment, more void-capable missiles, etc.
(e.g. a best quality starhawk would be able to shower missiles on a poor quality fury squadron and get away with it)

Enemies Without, if I recall correclty, is supposed to expand the rules for vehicles; so maybe they'll shed some light on that.

When we use attack craft, we outfit them for the mission. Ground attack will have shields and weapons meant for that, naturally, and space-attack and air-attack will have them accordingly. We now have four gun-cutters, each optimized for a specific job. We made one to drop troops behind an Ork encampment while another dropped in our Guard troops while their Chimeras teleported in with our Teleportarium. The Orks didn't stand a chance, and I only had one casualty because he shot himself with his own las-rifle.

We give our "Best" versions of vehicles a special ability on top of their normal stats. For example our group has a "stealth" gun cutter, which just makes it harder to detect. It's those little things that just make all the difference.