If you are looking for 210-230MHz at 2-2-2-5 BH-5 chip memory is where it's at. Anything more then that you will have to be lucky. Also to get the upper ranges, 230-240MHZ, these chips like their voltages.
If you have the money, buy Mushkin Black Level 2 memory. Their black PCB is top quality, and their support is the best. But it's costy.
If you don't have $157/512MB, then Buffalo PC3700 will "hopefully" get you the famed WinBond BH-5 chip for less. With this you should by all means be able to outperform more expansive XMS C2 and LL memory (CH-5).
If you want high FSB, 250-280MHz, then you need to get high latency DDR500. A-DATA is good for budget. OCZ Gold is good for high budget.
There, through one of these choices should content you, as they go from 220-280MHz I have listed.