Sounds like you isolated it to your tire, what with swapping tires. The other thing I would have suggested is *wheel bearing*. It can have different effects when it'* going, on mine it made kind of a "whump whump whump whump" sound in long, gradual curves to the right, like on an interstate on or off ramp. Note that it changed speed with changes in the car speed, not with engine revs. Our cars don't have replaceable bearings, you have to change out the wheel spindle. Keep this in your info kit in case the tires don't solve the problem.
97 SE, teflon wiper blades, Dunlop Sport A-2 tires, Leather steering wheel cover, Pioneer DEH-P480MP mp3 CDRW head unit, Pioneer 12-disc changer, iPod hookup, Boston Acoustic 3 way 6x9'*, Boston acoustic separates in door pods, Alpine 4 channel amp in trunk. Magnaflow dual outlet muffler and Ractive stainless tips. Autozone rice pipe and K&N 4750 intake kit. Clear corner lights. Energy Suspension end links.