Mutt,
your figures are pretty much correct, although I personally would doubt your landing distance figure of 6100ft. That might be landing ground run (not landing distance) with maximum braking and full reverse, but I wouldn't rate my chances of stopping a Classic (my jet - smaller brakes than the -400) from a 210kt Vref in much less than 9000ft! Boeing does promulgate a flapless landing procedure, but states that the chances of being in that situation are very, very remote - there is so much redundancy in the hydraulic, pneumatic and electrical flap operating systems. Incidentally, the leading-edge devices on Boeings are referred to as flaps, not slats.