Try Pit Road for a number of sets in plastic. And, while I don't have their
names, there are a couple of other manufacturers who do them in cast metal.
Best place to start would be on some of the ship modeling groups.
I know Skywave makes sets of modern naval aircraft in 1/700. They also have
sets of Strategic aircraft and Transports and armor (although I still have yet
to find a set of land-based modern Fighters.) Greatmodels.com sells them.