It's a tall order, given your budget. Of your choices I would lean toward the Torker, but I would be thinking of that bike as more utilitarian than speed demon. The Kona Worldbike is a 3-speed, all steel commuter with 26" tires. Again, no speed demon, but definitely could be ridden aggressively. For a bit more money (MSRP $649) there is the Schwinn Sporterra NX8; but it has an aluminum frameset. Still seems to me a decent value for a sporty IGH bike, though.