Memory bandwidth right now is not a bottleneck for the vast majority of people. A lot of folks seem to be on the fast memory bandwagon these days, buying the fastest rated memory they can find, going with the triple channel kits, buying memory rated for 2000mhz, etc. while you do get improved benchmark numbers, the actual improvement you see in real life is very small, hardly noticeable or worth the money you will spend. It's mostly marketing hype to get you to spend money on something you don't need.
Do you know that by default Phenom processors don't run memory in dual channel mode, and for most purposes this way is even faster than forcing the memory into dual channel mode? (this is the ganged/unganged setting in the BIOS on AMD boards)