I guess you're not aware that with FC3 you don't get all the missions for the stand-alone versions of the FC3 aircraft, and you don't get the individual wallpapers, either.
That said, I started with FC3, but then I purchased all FC3 aircraft by themselves to get a) all missions, and b) all wallpapers, but then again, the only one we cannot buy stand-alone is the J11A... so that's what we're waiting for.