Well with the price of Crucial's ram right now a good choice would be the Mushkin 2100 DDR High Performance ram. As of today 512mb is at $174, which is what my friend got it for a week ago. we have spoken to Mushkin also and they have told us that they can get 150 mhz with there memory. Even though they like to tell you not to overclock if you speak to the right person there they will tell you they get 150 fsb with their memory.