Also, Strike series. Strike series is fucking awesome. Except for Urban Strike, that was shit.
I have this idea for a game which is a sandbox version of Strike, but with elements of Choplifter and Dead Rising. Basically, it'd be set in a cyberpunk future Japan, where there'd be lots of these man-made islands off the western coast in the Sea of Japan, and they would be under threat from some super-typhoon, because global warming. Anyway, Best Korean black ops (because there will always be a Best Korea) use it to steal Japanese technology of some kind - probably a fusion reactor, particle beam weapon or cat food. So you'd have have a time limit to stop Best Korea, but also save people and do other things before Super-Typhoon Kira Yamato pretty much destroys everything.
And you'd have a bunch of different vehicles at your disposal.