Batman is probably a spd 6 or 7. if you built him on 250-350, he'd easily be able to keep up with most every MA character in that range. But the reason Bats awlways has a phase to burn is he holds em, not because of the sheer number he has.
Superman, remember, is nearly as fast as the Flash, both in terms of straight-line acceleration and velocity, but also dexterity and data processing (thinking speed). He's got to be near a 12 on the speed chart, at least when he pushes it.
On the other hand, in an older issue of currect-continuity JLA, Flash "lent" some Speed Force to Supes (Probably a SPD Aid or Succor, plus a movement Aid or Succor), so Superman is probably around a 10.
What you may wish to consider is a truer Brink character than Superman, someone like The Thing. He is probably more like a Speed 4 or 5, even though he has shown quite a bit of combat finesse, as well as strength and toughness.
Compare this to Flash, who has the ability to act tremendously quickly (probably something like a long-lasting omni-CE in an EC with some other speed tricks), but is a dreadfully slow thinker- at most, a speed 6 with some sort of SPD and movement Aid or Succor, as I suggested above for Superman in that particular case.