1066 memory is actual not too bad, even if DDR2, depending on the timings. What are the timings? Do you plan to OC? Is your memory 2 x 2GB?
Do you require a micro-ATX mobo? Note that for both of the micro-ATX boards in the list I provided of JetWay boards supporting both DDR2 and DDR3, the maximum DDR3 memory is 1066; in the ATX board it is only 1333 - so neither leaves much room for getting faster memory. And if the timings are slower than what you have, the DDR3 memory might be slower.