You are right the price difference is minimal right now. I fully expect the prices of the Duron to drop. When new processors come out, the high end of the line is aways priced high, so it is no surprise that the 700 Duron is about the price of the 700 Athlon. Also remember that the price of the 700 Classic Athlon is hitting the bottom, which usually signals the end of product cycle.
All in all there are some great processors out there for some really fantastic prices.
You don't have to shell out $3K for a gaming box anymore