My understanding was that dual-channel needed at least PC3200 RAM (400 MHz); the difference in price is probably due to the fact that if you're not running in dual-channel mode most mobos fall back to PC2700 speeds (333 MHz), so if you're not running dual-channel there's no point in buying the more expensive PC3200 RAM. The fact that you need 2x sticks of identical RAM for dual channel does not add as much to the price as the difference between PC2700/PC3200.
The only issue concerning FSB speed that I'm aware of is the case of the size of the memory modules on certain chipsets. For example, the NForce 2 Ultra board I own, says in the manual, will only support modules up to 512MB @ PC3200. Modules larger than 512MB are only supported @ PC2700. This is probably an electrical timing or loading issue. In this case I didn't really care because the CPU runs at 333MHz and I wasn't planning on doing any overclocking.
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